**U.S. DEPARTMENT OF COMMERCE**

**NATIONAL OCEANIC AND ATMOSHPERIC ADMINSTISTRATION**

**NATIONAL WEATHER SERVICE**

**OFFICE OF SCIENCE AND TECHNOLOGY**

**METEROLOGICAL DEVELOPMENT LABORATORY**

**Digital Weather Markup Language**

**Specification**

**(Version 1.0)**

**12 November 2023**

Table of Contents

[**List of Figures** i](#__RefHeading___Toc170121548)

[**List of Tables** ii](#__RefHeading___Toc170121549)

[1. **Overview**: 1](#__RefHeading___Toc170121550)

[1.1. **DWML Requirements** 1](#__RefHeading___Toc170121551)

[1.2. **DWML Structure** 1](#__RefHeading___Toc170121552)

[1.3. **Sample Document** 1](#__RefHeading___Toc170121553)

[2. **DWML Data Element Nomenclature**: 1](#__RefHeading___Toc170121554)

[3. **Framework Elements**: 2](#__RefHeading___Toc170121555)

[3.1. **\<dwml\> Element** 2](#__RefHeading___Toc170121556)

[3.1.1. ***version* Attribute** 2](#__RefHeading___Toc170121557)

[3.2. **\<head\> Element** 2](#__RefHeading___Toc170121558)

[3.3. **\<data\> Element** 2](#__RefHeading___Toc170121559)

[4. **DWML Metadata Elements** 2](#__RefHeading___Toc170121560)

[4.1. **\<product**\> **Element** 2](#__RefHeading___Toc170121561)

[4.1.1. ***concise-name* Attribute** 3](#__RefHeading___Toc170121562)

[*4.1.2.* ***srsName Attribute*** 3](#__RefHeading___Toc170121563)

[4.1.3. ***operational-mode Attribute***
3](#__RefHeading___Toc170121564)

[4.1.4. **\<title**\> **Element** 3](#__RefHeading___Toc170121565)

[4.1.5. **\<field\> Element** 3](#__RefHeading___Toc170121566)

[4.1.6. **\<category\> Element** 4](#__RefHeading___Toc170121567)

[4.1.7. **\<creation-date\> Element** 4](#__RefHeading___Toc170121568)

[4.2. **\<source\> Element** 4](#__RefHeading___Toc170121569)

[4.2.1. **\<more-information\> Element**
4](#__RefHeading___Toc170121570)

[4.2.2. **\<production-center\> Element**
4](#__RefHeading___Toc170121571)

[4.2.3. **\<disclaimer\> Element** 4](#__RefHeading___Toc170121572)

[4.2.4. **\<credit\> Element** 5](#__RefHeading___Toc170121573)

[4.2.5. **\<credit-logo\> Element** 5](#__RefHeading___Toc170121574)

[4.2.6. **\<feedback\> Element** 5](#__RefHeading___Toc170121575)

[5. **DWML Data Elements** 5](#__RefHeading___Toc170121576)

[5.1. **\<location\>** Element 5](#__RefHeading___Toc170121577)

[5.1.1. **\<location-key\>** Element 5](#__RefHeading___Toc170121578)

[5.1.2. **\<point\> Element** 5](#__RefHeading___Toc170121579)

[5.1.3. **\<city\> Element** 5](#__RefHeading___Toc170121580)

[5.1.4. **\<nws-zone\> Element** 6](#__RefHeading___Toc170121581)

[5.1.5. **\<area\> Element** 6](#__RefHeading___Toc170121582)

[5.1.6. **\<point\> Element** 6](#__RefHeading___Toc170121583)

[5.1.7. **\<point\> Element** 7](#__RefHeading___Toc170121584)

[5.1.8. **\<point\> Element** 7](#__RefHeading___Toc170121585)

[5.1.9. **\<point\> Element** 7](#__RefHeading___Toc170121586)

[5.1.10. **\<point\> Element** 7](#__RefHeading___Toc170121587)

[5.1.11. **\<height\> Element** 7](#__RefHeading___Toc170121588)

[5.1.12. **\<level\> Element** 7](#__RefHeading___Toc170121589)

[5.1.13. **\<layer\> Element** 8](#__RefHeading___Toc170121590)

[5.2. **\<moreWeatherInformation\> Element**
8](#__RefHeading___Toc170121591)

[5.2.1. ***applicable-location* Attribute**
8](#__RefHeading___Toc170121592)

[5.3. **\<time-layout\> Element** 8](#__RefHeading___Toc170121593)

[5.3.1. ***time-coordinate*** **Attribute**
8](#__RefHeading___Toc170121594)

[5.3.2. **\<layout-key\> Element** 8](#__RefHeading___Toc170121595)

[5.3.3. **\<start-valid-time\> Element**
9](#__RefHeading___Toc170121596)

[5.3.4. **\<end-valid-time\> Element** 9](#__RefHeading___Toc170121597)

[5.4. **\<parameters\>** **Element** 9](#__RefHeading___Toc170121598)

[5.4.1. ***applicable-location* Attribute**
9](#__RefHeading___Toc170121599)

[5.4.2. **\<temperature\> Element** 9](#__RefHeading___Toc170121600)

[5.4.3. **\<precipitation\>** **Element**
11](#__RefHeading___Toc170121601)

[5.4.4. **\<probability-of-precipitation\> Element**
12](#__RefHeading___Toc170121602)

[5.4.5. **\<convective-hazard\> Element**
13](#__RefHeading___Toc170121603)

[5.4.6. **\<wind-speed\> Element** 14](#__RefHeading___Toc170121604)

[5.4.8. **\<cloud-amount\> Element** 18](#__RefHeading___Toc170121605)

[5.4.9. **\<weather\> Element** 19](#__RefHeading___Toc170121606)

[5.4.10. **\<humidity\> Element** 20](#__RefHeading___Toc170121607)

[5.4.11. **\<conditions-icons\>** **Element**
21](#__RefHeading___Toc170121608)

[5.4.12. **\<water-state\>** **Element**
22](#__RefHeading___Toc170121609)

[5.5. **\<categorical-definitions\>** **Element**
26](#__RefHeading___Toc170121610)

[5.5.1. **\<categorical-table\>** **Element**
26](#__RefHeading___Toc170121611)

[5.6. **\<conversion-definitions\>** **Element**
26](#__RefHeading___Toc170121612)

[5.6.1. **\<conversion-table\>** **Element**
26](#__RefHeading___Toc170121613)

[6. **Latitude and Longitude List**s 27](#__RefHeading___Toc170121614)

[6.1. \<latLonList\> Element 27](#__RefHeading___Toc170121615)

[7. **Common Element and Attribute Definitions**
27](#__RefHeading___Toc170121616)

[7.1.1. ***latitude* Attribute** 27](#__RefHeading___Toc170121617)

[7.1.2. ***longitude*** **Attribute** 27](#__RefHeading___Toc170121618)

[7.2. ***vertical-coordinate* Attribute**
27](#__RefHeading___Toc170121619)

[7.3. ***summarization* Attribute** 28](#__RefHeading___Toc170121620)

[7.4. ***time-layout*** **Attribute** 28](#__RefHeading___Toc170121621)

[8. **XML Considerations** 28](#__RefHeading___Toc170121622)

[8.1. **Namespace** 28](#__RefHeading___Toc170121623)

[8.2. **Schema** 28](#__RefHeading___Toc170121624)

[8.3. **Character Set** 28](#__RefHeading___Toc170121625)

[**Appendix A: DWML Requirements** 29](#__RefHeading___Toc170121626)

[1. **Overview** 29](#__RefHeading___Toc170121627)

[2. **XML Components** 29](#__RefHeading___Toc170121628)

[3. **DWML Validation** 32](#__RefHeading___Toc170121629)

[**4.** **General Characteristics** 32](#__RefHeading___Toc170121630)

[5. **Product Samples** 32](#__RefHeading___Toc170121631)

[**Appendix B: Requirements Correlation Matrix**
36](#__RefHeading___Toc170121632)

[**Appendix C: Data Model** 38](#__RefHeading___Toc170121633)

[**Appendix D: Product Samples** 45](#__RefHeading___Toc170121634)

[**Forecast at a Glance** 45](#__RefHeading___Toc170121635)

[**NWS Web Site Product** 45](#__RefHeading___Toc170121636)

[**Analogous DWML** 45](#__RefHeading___Toc170121637)

[**Digital Tabular Forecast** 48](#__RefHeading___Toc170121638)

[**Sample Digital Tabular Forecast Product**
48](#__RefHeading___Toc170121639)

[**Analogous DWML** 48](#__RefHeading___Toc170121640)

[**Digital Zone Forecast** 53](#__RefHeading___Toc170121641)

[**Sample Digital Zone Forecast Product**
53](#__RefHeading___Toc170121642)

[**Analogous DWML** 53](#__RefHeading___Toc170121643)

[**Model Output Statistics Bulletin** 57](#__RefHeading___Toc170121644)

[**Sample Model Output Statistics Product**
57](#__RefHeading___Toc170121645)

[**Analogous DWML** 57](#__RefHeading___Toc170121646)

[**Appendix E: Type Definitions** 69](#__RefHeading___Toc170121647)

[**Appendix F: References** 91](#__RefHeading___Toc170121648)

[]{#__RefHeading___Toc170121548 .anchor}**List of Figures**

[Figure 1. Example Forecast at a Glance Product
33](#__RefHeading___Toc140640293)

[Figure 2. Example Digital/Tabular Forecast Product
33](#__RefHeading___Toc140640294)

[Figure 3. Example Digital Zone Forecast Product
33](#__RefHeading___Toc140640295)

[Figure 4. Forecast at a Glance 45](#__RefHeading___Toc140640296)

[Figure 5. Digital/Tabular Forecast 48](#__RefHeading___Toc140640297)

[Figure 6. Digital Zone Forecast 53](#__RefHeading___Toc140640298)

[Figure 7: Sample Model Output Statistics Bulletin.
57](#__RefHeading___Toc140640299)

[]{#__RefHeading___Toc170121549 .anchor}**List of Tables**

[Table 1. DWML Content by Product 35](#__RefHeading___Toc141760771)

[Table 2: Sky Cover to Text Conversion (Source: NWSI 10-503).
80](#__RefHeading___Toc141760772)

[Table 3: Valid Values for Weather Coverage Attribute.
80](#__RefHeading___Toc141760773)

[Table 4: Valid Values for Weather Intensity.
80](#__RefHeading___Toc141760774)

[Table 5: Valid Weather Values. 81](#__RefHeading___Toc141760775)

[Table 6: Valid Weather Attributes. 81](#__RefHeading___Toc141760776)

[Table 7: Valid Visibility Values. 82](#__RefHeading___Toc141760777)

[Table 8: NDFDgen Night Time Icon Algorithm (priority in ascending
order). 83](#__RefHeading___Toc141760778)

[Table 9: NDFDgen Day Time Icon Algorithm (priority in ascending order).
84](#__RefHeading___Toc141760779)

[Table 10: NDFDgenByDay Night Time Icon Algorithm (format = '12 hourly')
(priority in ascending order). 86](#__RefHeading___Toc141760780)

[Table 11: NDFDgenByDay Day Time Icon Algorithm (format = '12 hourly' or
'24 hourly) (priority in ascending order).
87](#__RefHeading___Toc141760781)

[Table 12: NDFDgenByDay Weather Summary Phrases (format = '12 hourly' or
'24 hourly') (priority in ascending order).
90](#__RefHeading___Toc141760782)

[Table 13: NDFDgenByDay Weather Summary Phrases (format = '12 hourly')
(priority in ascending order). 90](#__RefHeading___Toc141760783)

1.  []{#__RefHeading___Toc170121550 .anchor}**Overview**:

This document defines the Digital Weather Markup Language (DWML). DWML
is a new XML language which is being developed to initially support the
exchange of the National Weather Service's (NWS) National Digital
Forecast Database (NDFD) data. However, the specification is being
written with enough flexibility to accommodate other environmental
science applications. Appendix E provides a definition of DWML types
based on restrictions appropriate to NDFD data. Other sets of
restrictions similar to those in Appendix E need to be established for
other specific implementations.

1.  []{#__RefHeading___Toc170121551 .anchor}**DWML Requirements**

This specification attempts to include requirements in the MDL NDFD XML
Requirements document (Appendix A). The matrix in Appendix B indicates
which design feature satisfies which requirement.

2.  []{#__RefHeading___Toc170121552 .anchor}**DWML Structure**

The tree diagrams in Appendix C provide a graphical representation of
how DWML elements and attributes relate to each other. These
relationships in concert with the DWML type definitions in Appendix E
form the basis for language validation.

3.  []{#__RefHeading___Toc170121553 .anchor}**Sample Document**

In addition to providing a definition of the elements and their
attributes, this specification provides sample DWML documents in
Appendix D for the three products proposed in the NDFD XML Requirements
document. Appendix D also includes the application of DWML elements to a
Model Output Statistics (MOS) bulletin. The MOS bulletin example is a
non-NDFD example and so it does not conform to the NDFD type
definitions. The MOS bulletin example is provided merely to illustrate
the flexibility of DWLM to handle other data sources.

2.  []{#__RefHeading___Toc170121554 .anchor}**DWML Data Element
    Nomenclature**:

This specification uses the following approach to describing elements:

1)  Element and attribute names are all lower case.

2)  Element and attribute names use a hyphen ("-") to separate multiple
    word names so as to improve readability (ex. \<creation-date\>).
    Attribute and element names avoid the use of abbreviations to
    enhance readability.

3)  Within this document, child elements are nested in a sub-paragraph
    under their parents.

4)  Attributes are also nested but do not have the angle brackets
    ("\<\>") and are italicized.

5)  The element's and attribute's type is provided in braces ("{}"). For
    more information on each type refer to Appendix E.

6)  If the element can occur zero or more times, an asterisk ("\*") is
    placed after its name. See specification 5.2.1.5 for an example.

7)  If the element occurs zero or one times, a question mark ("?")
    follows its name. See specification 4.1.3 for an example.

8)  If the element must appear at least once, a plus sign ("+") trails
    its name. See specification 5.2.1 for an example.

9)  Element names without a special trailing character must occur
    exactly once. Specification 3.1 provides an example of an element
    that is required exactly once.

10) Each DWML specification references the requirement that it is
    designed to meet. The requirement is positioned at the end of the
    specification and contained in parentheses. For example,
    specification 3.1 satisfies requirement 4.2.

11) The order of element descriptions in the paragraphs below is not
    significant. Any required ordering of elements is specified in the
    tree diagrams found in Appendix C and type definitions in Appendix
    E.

```{=html}
<!-- -->
```
3.  []{#__RefHeading___Toc170121555 .anchor}**Framework Elements**:

    1.  []{#__RefHeading___Toc170121556 .anchor}**\<dwml\> Element**

The **\<**dwml**\>** element {dw:dwmlType}: The root element for DWML
(R4.2).

1.  []{#__RefHeading___Toc170121557 .anchor}***version* Attribute**

The *version* attribute {xsd:string} indicates which version of DWML the
instance contains (R2.1.3).

2.  []{#__RefHeading___Toc170121558 .anchor}**\<head\> Element**

The \<head\> element {dw:headType} contains the metadata for the DWML
instance. See section 4 for elements found in the \<head\> element
(R4.2).

3.  []{#__RefHeading___Toc170121559 .anchor}**\<data\> Element**

The \<data\> element {dw:dataType} contains the environmental data. See
section 5 for child elements of the \<data\> element (R4.2 and R2.2).

4.  []{#__RefHeading___Toc170121560 .anchor}**DWML Metadata Elements**

DWML metadata provides information about the DWML product and the data
it contains. These elements are children of the \<head\> element.

1.  []{#__RefHeading___Toc170121561 .anchor}**\<product**\> **Element**

The \<product\> element {dw:productType} holds meta information about
the product.

1.  []{#__RefHeading___Toc170121562 .anchor}***concise-name* Attribute**

The *concise-name* attribute {dw:concise-nameType} represents a name or
code that describes this product. The concise-nameType will have a list
of names that is extensible to support secondary developer additions.
Sample values include "glance", "digital-tabular", "digital-zone"
(Derived From R2.1.1).

2.  []{#__RefHeading___Toc170121563 .anchor}***srsName Attribute***

The srsName attribute {dw:srsNameType} communicates the spatial
reference system used by NDFD. The NDFD spatial reference system is the
"WGS 1984".

3.  []{#__RefHeading___Toc170121564 .anchor}***operational-mode
    Attribute***

The *operational-mode* attribute {dw:operational-modeType} defines the
status of the product. Applications can review the content of this
element to determine if they should perform further processing. Sample
values include "test", "developmental", "experimental", and "official"
product. (R2.1.4)

1.  Test Product

The "test" product indicates that this is an instance of an existing
DWML product that contains some change being evaluated by a DWML
development team. Users will typically not process this product
(R2.1.4.1).

2.  Developmental Product

The "developmental" product represents a new product that is not yet
ready for public evaluation or use (R2.1.4.2).

3.  Experimental Product

This product is available for testing and evaluation for a specified,
limited time period for the explicit purpose of obtaining customer
feedback. (R2.1.4.3).

4.  Official Product

The "official" product identifies an instance of an established DWML
product. This DWML instance is part of the approved product suite
available from the NWS (R2.1.4.4).

4.  []{#__RefHeading___Toc170121565 .anchor}**\<title**\> **Element**

The \<title\> element {xsd:string} \[?\] provides a concise
summarization of what this DWML product contains (R2.1.1).

5.  []{#__RefHeading___Toc170121566 .anchor}**\<field\> Element**

The \<field\> Element {dw:fieldType} specifies the general area within
the environmental sciences that the data contained in the DWML instance
is from. Example values include "meteorological", "hydrological",
"oceanographical", "land surface", and "space" (R2.1.5).

6.  []{#__RefHeading___Toc170121567 .anchor}**\<category\> Element**

The \<category\> Element {dw:categoryType} \[?\] defines the specific
category that the product belongs to. Example values include
"observation", "forecast", "analysis", and "statistic" (R2.1.6).

7.  []{#__RefHeading___Toc170121568 .anchor}**\<creation-date\>
    Element**

The \<creation-date\> Element {xsd:creation-dateType} contains the date
and time that the product was prepared (R2.1.2).

1.  ***refresh-frequency* Attribute**

The *refresh-frequency* attribute {xsd:duration} is used by the
production center to help users know how often to return for updated
data. In the case of the NDFD, the data is updated on an as needed
basis. As a result the frequency provided may not always ensure users
update as soon as new data is available. The frequency will also not
guarantee that that when updates are done that the retrieved data is
new. Still, the suggested refresh frequency will help well mannered
users know what the provider believes is a reasonable time between
repeated accesses of the system (R2.1.14).

2.  []{#__RefHeading___Toc170121569 .anchor}**\<source\> Element**

The \<source\> Element {dw:sourceType} \[?\] holds information about the
product's source and links to credit and disclaimer information.

1.  []{#__RefHeading___Toc170121570 .anchor}**\<more-information\>
    Element**

The \<more-information\> element {xsd:anyURI} is a link to the web page
of the forecast's source or a more complete forecast (R2.1.13).

2.  []{#__RefHeading___Toc170121571 .anchor}**\<production-center\>
    Element**

The \<production-center\> element {xsd:production-centerType} \[?\]
identifies which organization creates the product (R2.1.7).

1.  **\<sub-center\> Element**

The \<sub-center\> element {xsd:string} \[?\] is the part of the
production center that prepared the product (R2.1.8).

3.  []{#__RefHeading___Toc170121572 .anchor}**\<disclaimer\> Element**

The \<disclaimer\> element {xsd:anyURI} \[?\] is the URL containing a
disclaimer regarding the data (R2.1.9).

4.  []{#__RefHeading___Toc170121573 .anchor}**\<credit\> Element**

The \<credit\> Element {xsd:anyURI} \[?\] is the URL used to credit the
source of the data (R2.1.10).

5.  []{#__RefHeading___Toc170121574 .anchor}**\<credit-logo\> Element**

The \<credit-logo\> element {xsd:anyURI} \[?\] is the image link used
with the credit URL to acknowledge the data source (R.2.11).

6.  []{#__RefHeading___Toc170121575 .anchor}**\<feedback\> Element**

The \<feedback\> Element {xsd:anyURI} \[?\] is a URL to a web page used
to provide the production center comments on the product (R2.1.12).

5.  []{#__RefHeading___Toc170121576 .anchor}**DWML Data Elements**

These elements hold the environmental data. They are children of the
\<data\> element.(R2.2).

1.  []{#__RefHeading___Toc170121577 .anchor}**\<location\>** Element

The \<location\> element {dw:locationType} \[+\]: Defines the location
for the data contained in the element \<data\>. The element must contain
exactly one of its child elements (R2.2.2).

1.  []{#__RefHeading___Toc170121578 .anchor}**\<location-key\>** Element

The \<location-key\> element {dw:location-keyType} \[?\] is used to
relate the location to its corresponding parameters (R2.2.2).

2.  []{#__RefHeading___Toc170121579 .anchor}**\<point\> Element**

For information on the \<point\> element see Section 7.1

1.  ***summarization* Attribute**

For information on the *summarization* attribute see Section 7.3.

3.  []{#__RefHeading___Toc170121580 .anchor}**\<city\> Element**

The \<city\> element {dw:cityType} \[?\] contains the city name for
which the data is valid (R2.2.2).

1.  ***state*** Attribute

The ***state*** attribute {dw:stateType} holds the two digit
abbreviation for the state that the city resides in (R2.2.2).

2.  ***summarization* Attribute**

For information on the *summarization* attribute see Section 7.3.

4.  []{#__RefHeading___Toc170121581 .anchor}**\<nws-zone\> Element**

The \<nws-zone\> element {dw:nws-zoneType} \[?\] contains the National
Weather Service forecast zone name for which the data is valid (R2.2.2).

1.  ***state*** Attribute

The ***state*** attribute {dw:stateType} holds the two digit
abbreviation for the state that the city resides in (R2.2.2).

2.  ***summarization* Attribute**

For information on the *summarization* attribute see Section 7.3.

5.  []{#__RefHeading___Toc170121582 .anchor}**\<area\> Element**

The \<area\> element {dw:areaType} \[?\] is a geometrical shape may be
used to define which grid points the data represents. The element must
contain exactly one of its child elements (Derived from R2.2.1.5).

1.  ***area-type* Attribute**

The *area-type* attribute {dw:area-typeType} defines the aerial shape
being used. Permissible values include "circle" and "rectangle" (Derived
from R2.2.1.5).

2.  **\<circle\> Element**

The \<circle\> element {dw:circleType} \[?\] is a circular area about a
grid point. The area can contain any number of grid points which are
summarized.

6.  []{#__RefHeading___Toc170121583 .anchor}**\<point\> Element**

For information on the \<point\> element see Section 7.1

1.  **\<radius\> Element**

The \<radius\> element {dw:radiusType} is the distance from the center
point of the circle to edge of the circular area (Derived from
R2.2.1.5).

1.  ***radius-units*** **Attribute**

The *radius-units* attribute {dw:radius-unitsType) is the units of the
radius measurement. Example values include "statute miles" and
"kilometers" (Derived from R2.2.1.5).

1.  ***summarization* Attribute**

For information on the *summarization* attribute see Section 7.3.

2.  **\<rectangle\> Element**

The \<rectangle\> element {dw:rectangleType} \[?\] is a rectangular area
which is defined by four latitude and longitude pairs. The area can
contain any number of grid points which are summarized.

7.  []{#__RefHeading___Toc170121584 .anchor}**\<point\> Element**

For information on the \<point\> element see Section 7.1

8.  []{#__RefHeading___Toc170121585 .anchor}**\<point\> Element**

For information on the \<point\> element see Section 7.1

9.  []{#__RefHeading___Toc170121586 .anchor}**\<point\> Element**

For information on the \<point\> element see Section 7.1

10. []{#__RefHeading___Toc170121587 .anchor}**\<point\> Element**

For information on the \<point\> element see Section 7.1

1.  ***summarization* Attribute**

For information on the *summarization* attribute see Section 7.3.

11. []{#__RefHeading___Toc170121588 .anchor}**\<height\> Element**

The \<height\> element {dw:heightType} \[?\] is the data point's
distance above/below some datum. If this element is not present, it is
assumed that the data values are surface based (R2.2.2.3.1).

1.  ***datum* Attribute**

The *datum* attribute {dw:datumType} is the reference for the height
measurement. Example values include "surface" and "mean sea level"
(R2.2.2.3.1.1).

2.  ***height-units*** Attribute

The *height-units* attribute {dw:unitsType}represents the units of
measure used for the height value. Example values include "feet" and
"meters" (R2.2.2.3.1.2).

12. []{#__RefHeading___Toc170121589 .anchor}**\<level\> Element**

The \<level\> element {dw:levelType} \[?\] allows the data to be valid
at some specific level. For example, within model data, a value may
apply to a sigma level (R2.2.2.3.2).

1.  ***vertical-coordinate* Attribute**

For information on the *vertical-coordinate* attribute see Section 7.2.

13. []{#__RefHeading___Toc170121590 .anchor}**\<layer\> Element**

The \<layer\> element {dw:layerType} \[?\] allows the data to be valid
for some specific layer. For example, within model data, a value may be
valid through a sigma layer (R2.2.2.3.3).

1.  ***vertical-coordinate* Attribute**

For information on the *vertical-coordinate* attribute see Section 7.2.

2.  []{#__RefHeading___Toc170121591 .anchor}**\<moreWeatherInformation\>
    Element**

The \<moreWeatherInformation\> element {xsd:anyURI} contains a link to
the NDFD point-and-click forecast page for each set of user requested
lat/lon pairs.

1.  []{#__RefHeading___Toc170121592 .anchor}***applicable-location*
    Attribute**

The *applicable-location* attribute {dw:applicable-locationType} \[?\]
is used to relate the location to a particular list of parameters
(R2.2.1). In this case it is the user requested point number.

3.  []{#__RefHeading___Toc170121593 .anchor}**\<time-layout\> Element**

The \<time-layout\> element {dw:time-layoutType } \[+\] contains the
start and stop valid times and any associated period names for the data.
Since different environmental parameters have different time schemes
(valid at different interval and available for different lengths of time
into the future), there will be one \<time-layout\> element for each of
these unique temporal configurations. Each data parameter will reference
exactly one of these time layouts (R2.2.3).

1.  []{#__RefHeading___Toc170121594 .anchor}***time-coordinate***
    **Attribute**

The *time-coordinate* attribute {dw:time-coordinateType} defines the
time coordinate as either "local time" or "UTC" (R2.2.3.3).

1.  ***summarization* Attribute**

For information on the *summarization* attribute see Section 7.3.

2.  []{#__RefHeading___Toc170121595 .anchor}**\<layout-key\> Element**

The \<layout-key\> element {dw:layout-keyType} contains the key
(**k-p24h-n7-1**) used to associated this time layout with a particular
parameter element (R2.2.3). The key is derived using the following
convention:

1)  **"k"** stands for key.

2)  **"p24h"** implies a data period length of 24 hours.

3)  **"n7"** means that the number of data times is 7.

4)  "**1**" is a sequential number used to keep the layout keys unique.

The key **should not** be parsed to derive the period. This is because,
the period length changes for some data type after day 3 and so period
length implied by the key name only applies to the early times.

1.  []{#__RefHeading___Toc170121596 .anchor}**\<start-valid-time\>
    Element**

The \<start-valid-time\> element {dw:start-valid-timeType} \[+\] is the
start time of the period of time for which the data is valid (R2.2.3.1).

1.  ***period-name* Attribute**

The *period-name* attribute {xsd:string} \[?\] contains the name
associated with this time interval (ex. TODAY) (R2.2.3.4).

2.  []{#__RefHeading___Toc170121597 .anchor}**\<end-valid-time\>
    Element**

The \<end-valid-time\> element {xsd:dateTime} \[\*\]: The end time of
the period of time for which the data is valid. The absence of this
attribute indicates that the element is valid at a specific time
(R2.2.3.2).

1.  []{#__RefHeading___Toc170121598 .anchor}**\<parameters\>**
    **Element**

The \<parameters\> element {dw:parametersType} \[+\] holds the
environmental data (R2.2.1).

1.  []{#__RefHeading___Toc170121599 .anchor}***applicable-location*
    Attribute**

The *applicable-location* attribute {dw:applicable-locationType} \[?\]
is used to relate the location to a particular list of parameters
(R2.2.1).

2.  []{#__RefHeading___Toc170121600 .anchor}**\<temperature\> Element**

The \<temperature\> Element {dw:temperatureType} \[\*\] is a
**c**ontainer for temperature data (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of temperature.
Example values include "maximum", "minimum", "temperature", "dew point",
"heat index", "wind chill" (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the
temperature value. Example values include "F", "C", and "K". The default
value is "F" (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The temperature value
reported to the nearest whole degree. Missing values are represented by
an empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a temperature range (R2.2.1).

2.  ***lower-range*** **Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a temperature range (R2.2.1).

5.  **\<valueWithUncertainty\> Element**

The \<valueWithUncertainty\> element {dw: valueWithUncertaintyType}
\[+\]**:** Element containing a \<value\> element and an \<uncertainty\>
element. Represents a value like 75°F + or minus 1.5°F. Missing values
are represented by an empty element and xsi:nil="true" (R2.2.1).

1.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The temperature value
reported to the nearest whole degree. Missing values are represented by
an empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a temperature range (R2.2.1).

2.  ***lower-range*** **Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a temperature range (R2.2.1).

2.  **\<uncertainty\> Element**

Specifies the uncertainty {dw: uncertaintyType} \[+\] associated with
the accompanying value.

1.  ***type* Attribute**

The *type* Attribute {dw:uncertaintyTypeType} specifies the type of
uncertainty. Example values include "analysis error" (R2.2.1.1).

2.  **\<error\> Element**

The \<error\> element {errorType} \[?\] holds an uncertainty value
characterized as an error.

1.  ***qualifier Attribute***

The qualifier attribute {dw:qualifierType} \[?\] is use to indicate how
the error is applied. For example, a qualifier set to a value of "+/-",
indicating the error is to be added and subtracted from the base value
to determine the range of values.

6.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\]: The name of this parameter. The
name value can be used for display purposes (R2.2.1.2).

7.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

8.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

3.  []{#__RefHeading___Toc170121601 .anchor}**\<precipitation\>**
    **Element**

The \<precipitation\> element {dw:precipitationType} \[\*\] is a
container for the precipitation values (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of precipitation
parameter. Example values include "liquid" and "snow" (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the
precipitation value. Example values include "inches" and "millimeters".
The default value is "inches" (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The precipitation type
parameter's value to the nearest integer value. Missing values are
represented by an empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a precipitation range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a precipitation range (R2.2.1).

5.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

6.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

7.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

4.  []{#__RefHeading___Toc170121602
    .anchor}**\<probability-of-precipitation\> Element**

The \<probability-of-precipitation\> element
{dw:probability-of-precipitationType} \[\*\] is a container for the
probability of precipitation (POP) values (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of POP parameter.
Example values include "12 hour" and "floating". Default value is "12
hour" (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the POP value.
Example values include "percent" (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The POP value to the
nearest integer value. Missing values are represented by an empty
element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a probability of POP range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a POP range (R2.2.1).

5.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

6.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

7.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

5.  []{#__RefHeading___Toc170121603 .anchor}**\<convective-hazard\>
    Element**

The \<convective-hazard\> element {dw:convective-hazardType} \[\*\] is a
container for the convective hazard values like hazard outlook,
tornadoes, hail, severe thunderstorms from the Storm Prediction Center
(R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of convective
hazard parameter. Example values include "outlook", "tornadoes", "hail",
"damaging thunderstorm wind" "extreme tornadoes", "extreme hail",
"extreme thunderstorm winds", "severe thunderstorms" and "extreme severe
thunderstorms". (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the convective
hazard value. Example values include "percent" (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The convective hazard
value to the nearest integer value. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a probability of convective hazard
range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a convective hazard range (R2.2.1).

5.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

6.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

7.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

6.  []{#__RefHeading___Toc170121604 .anchor}**\<wind-speed\> Element**

The \<wind-speed\> element {dw:wind-speedType} \[\*\] is a container for
the wind speed values (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of wind speed
parameter. Example values include "sustained", "cumulative34", and
"gust" (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the wind speed
values. Example values include "knots", "meters per second", and
"percent". The default value is "knots". NOTE: "percent" is used for
probabilistic winds (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The wind speed value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a wind speed range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a temperature range (R2.2.1).

5.  **\<valueWithUncertainty\> Element**

The \<valueWithUncertainty\> element {dw: valueWithUncertaintyType}
\[+\]**:** Element containing a \<value\> element and an \<uncertainty\>
element. Represents a value like 10 kts + or minus 2.0 kts. Missing
values are represented by an empty element and xsi:nil="true" (R2.2.1).

1.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The temperature value
reported to the nearest whole degree. Missing values are represented by
an empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a temperature range (R2.2.1).

2.  ***lower-range*** **Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a temperature range (R2.2.1).

2.  **\<uncertainty\> Element**

Specifies the uncertainty {dw: uncertaintyType} \[+\] associated with
the accompanying value.

1.  ***type* Attribute**

The *type* Attribute {dw:uncertaintyTypeType} specifies the type of
uncertainty. Example values include "analysis error" (R2.2.1.1).

2.  **\<error\> Element**

The \<error\> element {errorType} \[?\] holds an uncertainty value
characterized as an error.

1.  ***qualifier Attribute***

```{=html}
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```
3.  The qualifier attribute {dw:qualifierType} \[?\] is use to indicate
    how the error is applied. For example, a qualifier set to a value of
    "+/-", indicating the error is to be added and subtracted from the
    base value to determine the range of values.

```{=html}
<!-- -->
```
6.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

7.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

8.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

7.  **\<direction\> Element**

The \<direction\> element {dw:directionType} \[?\] is a container for
the direction values (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of wind direction.
Example values include "wind" and "swell". The default value is "wind"
(R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the wind
direction values. Example values include "degrees true" (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The wind direction value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a wind direction range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a wind direction range (R2.2.1).

5.  **\<valueWithUncertainty\> Element**

The \<valueWithUncertainty\> element {dw: valueWithUncertaintyType}
\[+\]**:** Element containing a \<value\> element and an \<uncertainty\>
element. Represents a value like 270° + or minus 5.0°. Missing values
are represented by an empty element and xsi:nil="true" (R2.2.1).

1.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The temperature value
reported to the nearest whole degree. Missing values are represented by
an empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a temperature range (R2.2.1).

2.  ***lower-range*** **Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a temperature range (R2.2.1).

2.  **\<uncertainty\> Element**

Specifies the uncertainty {dw:uncertaintyType} \[+\] associated with the
accompanying value.

1.  ***type* Attribute**

The *type* Attribute {dw:uncertaintyTypeType} specifies the type of
uncertainty. Example values include "analysis error" (R2.2.1.1).

2.  **\<error\> Element**

The \<error\> element {errorType} \[?\] holds an uncertainty value
characterized as an error.

1.  ***qualifier Attribute***

```{=html}
<!-- -->
```
3.  The qualifier attribute {dw:qualifierType} \[?\] is use to indicate
    how the error is applied. For example, a qualifier set to a value of
    "+/-", indicating the error is to be added and subtracted from the
    base value to determine the range of values.

```{=html}
<!-- -->
```
6.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

7.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

8.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

8.  []{#__RefHeading___Toc170121605 .anchor}**\<cloud-amount\> Element**

The \<cloud-amount\> element {dw:cloud-amountType} \[\*\] is a container
for the cloud amount values (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of cloud amount
values. Example values include "total" and "layered" (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the cloud
amount values. Example values include "percent" and "8ths". The default
value is "percent" (R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The cloud cover value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a range of cloud amount (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a range of cloud amount (R2.2.1).

5.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

6.  **\<cloud-layer\> Element**

    The \<cloud-layer\> element {dw:layerType} \[?\] is the layer
    containing the cloud amount. Example values include "high",
    "middle", and "low". This element is not present when the type
    attribute is set to "total" (Derived from R2.2.1).

7.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

8.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

9.  []{#__RefHeading___Toc170121606 .anchor}**\<weather\> Element**

The \<weather\> element {dw:weatherType} \[?\] is a container for the
weather values (R2.2.1).

1.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

2.  **\<weather-conditions\> Element**

The \<weather-conditions\> element {weather-conditionsType} \[+\] is a
container for up to three weather values that are used to describe the
weather conditions at a given time. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

3.  **\<value\> Element**

The \<value\> element {dw:valueType} \[\* (max of 5)\] hold the sensible
weather information. Missing values are represented by an empty element
and xsi:nil="true" (R2.2.1).

1.  ***coverage* Attribute**

The *coverage* attribute {dw:coverageType} \[?\] holds the weather
coverage value. Valid values for the NDFD are contained in Appendix E,
Table 3 (R2.2.1).

2.  ***intensity* Attribute**

The *intensity* attribute {dw:intensityType} \[?\] holds the weather
intensity. Valid values for the NDFD are contained in Appendix E, Table
4 (R2.2.1).

3.  ***additive*** **Attribute**

The *additive* attribute {dw:additiveType} \[?\] dictates whether the
following value element is combined using an "and" or an "or". For
example rain and snow vice rain or snow (R2.2.1).

4.  ***qualifier*** **Attribute**

The *qualifier* attribute {dw:qualifierType} \[?\] is used to
communicate a special aspect of the weather value. Valid values for the
NDFD are contained in Appendix E, Table 6 (R2.2.1).

5.  ***weather-type*** **Attribute**

The *weather-type* attribute {dw:weather-typeType} \[?\] captures the
weather element being forecast. Valid values for the NDFD are contained
in Appendix E, Table 5 (R2.2.1).

6.  **\<visibility\> Element**

The \<visibility\> element {dw:visibilityType} \[\*\] contains the
weather visibility value (R2.2.1).

1.  ***units*** **Attribute**

The *units* attribute {dw:unitsType} contains the units of the
visibility value. Example values include "statute miles" and "meters"
(R2.2.1).

4.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

5.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

6.  ***weather-summary Attribute***

The *weather-summary* Attribute {xsd:string} \[?\] is a short phrase
(\~2 words) used to summarize the weather conditions for that time.
Example phrases include "partly cloudy" and "scattered thunderstorms"
(R2.2.1).

10. []{#__RefHeading___Toc170121607 .anchor}**\<humidity\> Element**

The \<humidity\> Element {dw:humidityType} \[?\] is a container for
humidity values (R2.2.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of humidity.
Example values include "relative" and "specific" (R2.2.1.1).

2.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the humidity
values. Example values include "percent" and "kilogram/kilogram"
(R2.2.1.3).

3.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The humidity value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a relative humidity range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a relative humidity range (R2.2.1).

5.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

6.  ***categorical-table* Attribute**

The *categorical-table* attribute {dw:categorical-tableType} \[?\] is
the foreign key to a list of categories that define the meaning of the
value (R2.2.1).

7.  ***conversion-table* Attribute**

The *conversion-table* attribute {dw:conversion-tableType} \[?\] is the
foreign key to a list of conversions tables that provide a equivalent
value for the data (R2.2.1).

11. []{#__RefHeading___Toc170121608 .anchor}**\<conditions-icons\>**
    **Element**

The \<conditions-icons\> element {dw:conditions-iconsType} \[?\] holds a
URL for a weather icon depicting the cloud and precipitation conditions.
The icons will be consistent with other NWS forecast products (R5.1).

1.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of icons. Example
values include "forecast-NWS" (R2.2.1.1).

2.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

3.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

4.  **\<icon-link\>** **Element**

The \<icon-link\> element {xsd:anyURI} \[+\] contains the URL of the
icon used to represent weather conditions (R5.1).

NOTE: The priority algorithm for icon determination can be found in
Table 8--Table 11. In these tables, the nomenclature \[20,30...90,100\]
indicates that one of the 2 digit values appear in the icon file name.
For example, the rain icon could be ra20.jpg, ra30.jpg on up to
ra100.jpg.

12. []{#__RefHeading___Toc170121609 .anchor}**\<water-state\>**
    **Element**

The \<water-state\> Element {dw:water-stateType} \[?\] is a container
for sea and wave information. The seas element will not be present when
the waves or swell elements are used. The wave and swell can both appear
or they may appear separately (R2.2.1).

1.  ***time-layout Attribute***

For information on the *time-layout* attribute see Section 7.4.

2.  **\<seas\>** **Element**

The \<seas\> element {dw:seasType} \[?\] holds the height of the seas
which is a combination of both wind waves and swell (R2.2.1).

3.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of seas. An
example value includes "combined" (R2.2.1.1).

4.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the seas
values. Example values include "feet" and "meters" (R2.2.1.3).

5.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The seas value reported
to the nearest integer. Missing values are represented by an empty
element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a sea height range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a sea height range (R2.2.1).

6.  **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

7.  **\<waves\> Element**

The \<waves\> element {dw:wavesType} \[?\] holds the height of waves
generated by the [local]{.underline} wind blowing (R2.2.1).

8.  ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of waves. An
example value includes "wind" or "significant" (R2.2.1.1).

9.  ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the wave
values. Example values include "feet" and "meters" (R2.2.1.3).

10. **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The wave value reported
to the nearest integer. Missing values are represented by an empty
element and xsi:nil="true" (R2.2.1).

1.  ***upper-range*** Attribute

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a wave height range (R2.2.1).

2.  ***lower-range*** Attribute

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a wave height range (R2.2.1).

1.  ***period*** **Attribute**

The *period* attribute {xsd:nonNegativeIntegers} \[?\] holds the time,
in seconds for the passage of successive wave crests (R2.2.1).

2.  ***steepness*** **Attribute**

The *steepness* attribute {xsd:nonNegativeIntegers} \[?\] holds the
Ratio of wave height to wavelength. Theoretical wave steepness maximum
is around 1/10, after which the wave becomes unstable and breaks
(R2.2.1).

11. **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

12. **\<swell\>** **Element**

The \<swell\> element {dw:swellType} \[?\] holds the height of wind
waves which have traveled [beyond]{.underline} the wave generation
region (R2.2.1).

13. ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of swell. An
example value includes "significant" (R2.2.1.1).

14. ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the swell
values. Example values include "feet" and "meters" (R2.2.1.3).

15. **\<value\> Element**

The \<value\> element {dw:valueType} \[+\] contains the swell value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a swell height range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a swell height range (R2.2.1).

1.  ***period*** **Attribute**

The *period* attribute {xsd:nonNegativeIntegers} \[?\] holds the time,
in seconds for the passage of successive wave crests (R2.2.1).

2.  ***steepness*** **Attribute**

The *steepness* attribute {xsd:nonNegativeIntegers} \[?\] holds the
Ratio of wave height to wavelength. Theoretical wave steepness maximum
is around 1/10, after which the wave becomes unstable and breaks
(R2.2.1).

16. **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

1.  **\<direction\> Element**

The \<direction\> element {dw:directionType} \[+\] is a container for
the direction values (R2.2.1).

17. ***type* Attribute**

The *type* Attribute {dw:typeType} specifies the type of swell
direction. Example values include "wind" and "swell". The default value
is "wind" (R2.2.1.1).

18. ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the swell
direction values. Example values include "degrees true" (R2.2.1.3).

19. **\<value\> Element**

The \<value\> element {dw:valueType} \[+\] holds the direction value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a swell direction range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a swell direction range (R2.2.1).

20. **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

21. **ice-coverage** **Element**

The ice-coverage element {dw:ice-coverageType} \[?\] holds the amount of
ice on the water body (R2.2.1).

22. ***type* Attribute**

The *type* attribute {dw:typeType} specifies the type of ice coverage.
An example value includes "total" (R2.2.1.1).

23. ***units* Attribute**

The *units* attribute {dw:unitsType} defines the units of the ice
cverage values. Example values include "percent" (R2.2.1.3).

24. **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]**:** The ice coverage value
reported to the nearest integer. Missing values are represented by an
empty element and xsi:nil="true" (R2.2.1).

1.  ***upper-range* Attribute**

The *upper-range* attribute {dw:upper-rangeType} \[?\] holds the value
associated with the upper end of a ice coverage range (R2.2.1).

2.  ***lower-range* Attribute**

The *lower-range* attribute {dw:lower-rangeType} \[?\] holds the value
associated with the lower end of a ice coverage range (R2.2.1).

25. **\<name\>** **Element**

The \<name\> element {xsd:string} \[?\] is the name of this parameter.
The name value can be used for display purposes (R2.2.1.2).

2.  []{#__RefHeading___Toc170121610
    .anchor}**\<categorical-definitions\>** **Element**

The \<categorical-definitions\> element {dw:categorical-definitionsType}
\[?\] contains the definitions of categories found in parameter value
elements (R2.2.1).

1.  []{#__RefHeading___Toc170121611 .anchor}**\<categorical-table\>**
    **Element**

The \<categorical-table\> element {dw:categorical-table-elementType}
\[+\] contains the categorical data (R2.2.1).

1.  ***units* Attribute**

2.  The *units* attribute {dw:unitsType} defines the units of the data
    in the categories (R2.2.1).

3.  **\<categorical-key\> Element**

The \<categorical-key\> element {dw:categorical-keyType} is the primary
key relating the data in the parameter element to a particular
categorical table (R2.2.1).

4.  **\<value\> Element**

The \<value\> element {dw:valueType} \[+\]: The value found in the data
(R2.2.1).

1.  ***category*** {xsd:string}: The category corresponding to the value
    (R2.2.1).

```{=html}
<!-- -->
```
3.  []{#__RefHeading___Toc170121612
    .anchor}**\<conversion-definitions\>** **Element**

The \<conversion-definitions\> element {dw:conversion-definitionsType}
\[?\] contains look-up tables used to relate numerical data to an
equivalent value (R2.2.1).

1.  []{#__RefHeading___Toc170121613 .anchor}**\<conversion-table\>**
    **Element**

The \<conversion-table\> element {dw:conversion-table-elementType} \[+\]
holds the range of data associated with each equivalent value (R2.2.1).

1.  **\<conversion-key\>** **Element**

The \<conversion-key\> element {dw:conversion-keyType} contains the
primary key relating the data in the parameter element to a particular
conversion table (R2.2.1).

2.  **\<start-value\>** **Element**

The \<start-value\> element {dw:start-valueType} \[+\] is the starting
value of the range of data for which the value is equivalent (R2.2.1).

3.  **\<end-value\>** **Element**

The \<end-value\> element {dw:end-valueType} \[+\] is the ending value
of the range of data for which the value is equivalent (R2.2.1).

4.  **\<equivalent-value\>** **Element**

The \<equivalent-value\> element {xsd:string} \[+\] is the equivalent
value of the data (R2.2.1).

6.  []{#__RefHeading___Toc170121614 .anchor}**Latitude and Longitude
    List**s

    1.  []{#__RefHeading___Toc170121615 .anchor}\<latLonList\> Element

The \<latLonList\> element {dw:latLonListType} \[?\] holds a list of
latitude and longitude pairs that are contained in a subgrid. A latitude
and longitude pair is composed of a latitude value followed by a comma
followed by a longitude value (i.e. 38.98,-77.07). Each latitude and
longitude pair is separated by a space (i.e. 33.869922,-80.080906
33.914765,-80.074936).

7.  []{#__RefHeading___Toc170121616 .anchor}**Common Element and
    Attribute Definitions**

    1.  **\<point\>** **Element**

The \<point\> element {dw:pointType} \[?\] is the element used to define
the grid point for which the data is valid (R2.2.2).

1.  []{#__RefHeading___Toc170121617 .anchor}***latitude* Attribute**

The *latitude* attribute {xsd:decimal} defines the latitude of the point
where the data is valid (R2.2.2.2).

2.  []{#__RefHeading___Toc170121618 .anchor}***longitude***
    **Attribute**

The *longitude* attribute {xsd:decimal} defines the latitude of the
point where the data is valid (R2.2.2.2).

2.  []{#__RefHeading___Toc170121619 .anchor}***vertical-coordinate*
    Attribute**

The *vertical-coordinate* attribute {xsd:string} defines the data's
vertical position (R2.2.2.3).

3.  []{#__RefHeading___Toc170121620 .anchor}***summarization*
    Attribute**

The *summarization* attribute {dw:summarizationType} \[?\] indicates how
a collection of grid point values is summarized into a single value.
Example summarization types include "none", "mean", "median", "mode",
"maximum", "minimum", "12hourly", or "24hourly". A value of "none"
indicates that the values are valid at a single grid point or time
(R2.2.1.5).

4.  []{#__RefHeading___Toc170121621 .anchor}***time-layout***
    **Attribute**

The *time-layout* attribute {dw:time-layoutType} defines the key to the
appropriate valid times and any relevant period name information
(R2.2.3).

8.  []{#__RefHeading___Toc170121622 .anchor}**XML Considerations**

    1.  []{#__RefHeading___Toc170121623 .anchor}**Namespace**

DWML will use the namespace <http://www.nws.noaa.gov/mdl/ndfd/dwml>.

2.  []{#__RefHeading___Toc170121624 .anchor}**Schema**

DWML will use XML Schema to perform validity checking.

3.  []{#__RefHeading___Toc170121625 .anchor}**Character Set**

DWML will use UTF-8 encoding.

[]{#__RefHeading___Toc170121626 .anchor}**Appendix A: DWML
Requirements**

1.  []{#__RefHeading___Toc170121627 .anchor}**Overview**

This document defines the requirements for a markup language of the
National Oceanic and Atmospheric Administration's National Weather
Service's (NWS) National Digital Forecast Database (NDFD). This document
will refer to the new markup language as the Digital Weather Markup
Language (DWML). DWML will serve as a vehicle for transferring portions
of the NDFD to NOAA's customers and partners. The piece of the database
distributed in DWML will correspond to some subset of the available
weather elements, times, and grid points. While DWML will initially
focus on NDFD data, the intent is to make this new markup language
flexible and scaleable enough to accommodate other meteorological data
such as weather observations and guidance products.

1.  **Message**: A collection of DWML elements in a valid arrangement.

2.  **Product**: A collection of NWS information in a defined format.

3.  **Issuance**: A particular product.

```{=html}
<!-- -->
```
2.  []{#__RefHeading___Toc170121628 .anchor}**XML Components**

DWML contains both metadata as well as meteorological data. The two will
be clearly separated within a message.

1.  **DWML Metadata**: DWML metadata will provide information about the
    DWML message and the data it contains. The metadata will provide the
    following some of which may be optional for a given issuer.

    1.  **Product Title**: A concise summarization of what this DWML
        product contains.

    2.  **Product Creation Date**: The date and time that the product
        was prepared.

    3.  **DWML Version:** Indicates which version of DWML is being used.

    4.  **Operational Mode**: The operational mode tells the user if the
        message is produced as a developmental, experimental or official
        product, or a test. See [National Weather Service Instruction
        10-102](http://www.nws.noaa.gov/directives/010/pd01001002a.pdf)
        for additional details on changes in operational mode.

        1.  **Test**: Indicates that this is an instance of an existing
            DWML product that contains some change being evaluated by
            the DWML development team. Users will typically not process
            this product.

        2.  **Developmental**: A new product that is not yet ready for
            public evaluation or use.

        3.  **Experimental**: Product is available for testing and
            evaluation for a specified, limited time period for the
            explicit purpose of obtaining customer feedback.

        4.  **Official**: Operational products defined in NWS policy

    5.  **Product Class**: Product Class specifies the general type of
        product contained in a DWML instance. Expected values include
        meteorological, hydrological, oceanographical, land surface, and
        space.

    6.  **Product Type**: The product type defines the specific category
        of the product class to which the product belongs. Examples
        include observation, forecast, analysis, and statistic.

    7.  **Production Center**: Production Center identifies which
        organization creates the product.

    8.  **Product Sub-center**: The component of the product center that
        prepared the product.

    9.  **Disclaimer URL**: The URL containing an optional disclaimer
        that the production center wants users to know about.

    10. **Credit URL**: The URL used to credit the source of the data.

    11. **Credit Logo**: The optional image used with the credit URL to
        acknowledge the data source.

    12. **Feedback URL**: The optional URL to a web page used to provide
        the production center comments on the product.

    13. **Additional Information URL**: A link to a more complete
        forecast or the web page for the forecast's source.

    14. **Suggested Refresh Frequency**: Used by the production center
        to help users know how often to return for updated data. Since
        the NDFD is updated on an as needed basis, the frequency
        provided will not always ensure users update as soon as new data
        is available. The frequency will also not guarantee that that
        when updates are done that the retrieved data is new. Still, the
        suggested refresh frequency will help well mannered users know
        what the provider believes is a reasonable time between repeated
        accesses of the system (i.e. seconds, days, months, etc).

2.  **DWML Data**: At the heart of NDFD data is a meteorological value
    with a geographical and temporal component. To define this value,
    DWML needs to provide the following information:

    1.  **Data Value**: This is the information retrieved or derived
        from the NDFD database (i.e. 71).

        1.  **Value Type:** The category to which the parameter belongs.
            For example, temperature is the category that contains
            maximum temperature, dew point temperature etc.

        2.  **Value Name:** The name of the parameter that the value
            measures (i.e. maximum temperature).

        3.  **Value Units**: The units of the parameter (i.e. °F).

        4.  **Value Precision**: The value needs to be provided with the
            correct number of significant digits (i.e. 71 °F).

        5.  **Type of Spatial Summarization**: Collections of grid point
            values may be summarized into a single value. If this is
            done, the type of summarization will be provided (mean,
            median, mode, centroid value etc.).

        6.  **Type of Temporal Summarization**: A number of grid point
            values may be summarized for a given period of time. When
            this is done, the type of temporal summarization will be
            provided (period, hourly, 3 hourly, daily, etc.).

    2.  **Data Location**: The three dimensional place that the data
        value applies to.

        1.  **Type of Geography**: Types of geography could include a
            point (lat/lon), city and state, county, National Weather
            Service forecast zone, and zip code.

        2.  **Horizontal Location**: The position of the data projected
            onto the earth's surface. This could be a latitude and
            longitude pair, a specific city and state, a county name, a
            National Weather Service zone name, or a zip code.

        3.  **Vertical Coordinate System**: The type of coordinates that
            define the data's vertical position (i.e. height above mean
            sea level, sigma, etc.). Dependant on the vertical
            coordinate system, one of the following will also be needed.

            1.  **Height**: This is the data point's distance
                above/below some datum.

                1.  **Datum**: This is the reference for the height
                    measurement (i.e. earth surface, mean sea level,
                    etc.).

                2.  **Units**: The units of measure used for the height
                    value.

            2.  **Level**: The digital data's vertical position may be
                defined at some discrete level.

            3.  **Layer**: The digital data's vertical position may be
                defined for some discrete layer.

    3.  **Data Time**: DWML will provide for arbitrary time periods as
        well as common time references.

        1.  **Start of Valid Time:** The start time of the period for
            which the data is valid.

        2.  **End of Valid Time:** The end time of the period for which
            the data is valid.

        3.  **Time Coordinate:** Can be either Local Time (LT) or
            Coordinated Universal Time (UTC).

        4.  **Period Name:** A textual description of the time embodied
            by the start and end times. For example, the time might
            correspond to "THIS AFTERNOON".

```{=html}
<!-- -->
```
3.  []{#__RefHeading___Toc170121629 .anchor}**DWML Validation**

    1.  DWML will adhere to the requirements defining well formed XML.

    2.  DWML will provide a schema to ensure any given instance conforms
        to the language's specifications.

    3.  DWML will use UTF-8 encoding.

4.  []{#__RefHeading___Toc170121630 .anchor}**General Characteristics**

    1.  DWML will use self describing element and attribute names.

    2.  DWML will employ industry standards to ensure the language is
        easy to maintain and is capable of later expansion.

5.  []{#__RefHeading___Toc170121631 .anchor}**Product Samples**

DWML should be capable of producing XML versions of the following three
existing National Weather Service's web products.

1.  **Forecast at a Glance**

> The current experimental grid point forecast [(on-line
> example)](http://www.crh.noaa.gov/ifps/MapClick.php?site=lwx&CiTemplate=1&FcstType=text&MapType=0&TempBox=1&DewBox=1&WindBox=1&ChillBox=1&SkyBox=1&SnowBox=1&FzgBox=1&SleetBox=1&map.x=186&map.y=60)
> contains the high or low temperature, the sky condition, and a weather
> icon. Figure 1 shows an example of the experimental forecast product.
> See Table 1 for DWML sample metadata and data values for this product.

2.  **Digital Tabular Forecast**

> The current experimental forecast [(on-line
> example)](http://www.crh.noaa.gov/ifps/MapClick.php?FcstType=digital&map.x=186&map.y=60&site=lwx&Radius=0&CiTemplate=0)
> contains hourly values for temperature, dew point temperature,
> probability of precipitation, wind direction and speed, sky cover, as
> well as precipitation type information. Figure 2 shows an example of
> this experimental forecast product. See Table 1 for DWML sample
> metadata and data values for this product.

3.  **Digital Zone Forecast**

> This product is similar to the Forecast at a Glance in that it uses 12
> hour forecast periods to summarize the NDFD data. The digital zone
> forecast is like the Digital Tabular Forecast in terms of its use of
> an extensive number of weather elements. Figure 3 shows an example
> product. See Table 1 for sample DWML metadata and data values for this
> product.

+---------+---------+---------+---------+---------+---------+---------+
| **This  | **To    | **Sat   | **S     | **S     | *       | **M     |
| Afte    | night** | urday** | aturday | unday** | *Sunday | onday** |
| rnoon** |         |         | Night** |         | Night** |         |
+---------+---------+---------+---------+---------+---------+---------+
| ![      | ![      | ![      | ![      | ![      | ![      | ![      |
| ](media | ](media | ](media | ](media | ](media | ](media | ](media |
| /image1 | /image2 | /image3 | /image4 | /image1 | /image2 | /image5 |
| .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ |
| width=" | width=" | width=" | width=" | width=" | width=" | width=" |
| 0.75972 | 0.76388 | 0.76388 | 0.76388 | 0.76388 | 0.76388 | 0.76388 |
| 2222222 | 8888888 | 8888888 | 8888888 | 8888888 | 8888888 | 8888888 |
| 2222in" | 8888in" | 8888in" | 8888in" | 8888in" | 8888in" | 8888in" |
| he      | he      | he      | he      | he      | he      | he      |
| ight="0 | ight="0 | ight="0 | ight="0 | ight="0 | ight="0 | ight="0 |
| .802083 | .805555 | .805555 | .805555 | .805555 | .805555 | .805555 |
| 3333333 | 5555555 | 5555555 | 5555555 | 5555555 | 5555555 | 5555555 |
| 334in"} | 556in"} | 556in"} | 556in"} | 556in"} | 556in"} | 556in"} |
+---------+---------+---------+---------+---------+---------+---------+
| Partly  | Partly  | Mostly  | Mostly  | Partly  | Partly  | Partly  |
| Cloudy  | Cloudy  | Cloudy  | Clear   | Cloudy  | Cloudy  | Cloudy  |
|         |         |         |         |         |         |         |
| Hi 74   | Lo 58   | Hi 79   | Lo 55   | Hi 81   | Lo 59   | Hi 77   |
| °F      | °F      | °F      | °F      | °F      | °F      | °F      |
+---------+---------+---------+---------+---------+---------+---------+

[]{#__RefHeading___Toc140640293 .anchor}Figure 1. Example Forecast at a
Glance Product

**Error! Not a valid link.**

[]{#__RefHeading___Toc140640294 .anchor}Figure 2. Example
Digital/Tabular Forecast Product

  ----------- ------------- ------------- -------------- ------------ --------------- ----------
              **This        **Tonight**   **Saturday**   **Saturday   **Sunday**      **Sunday
              Afternoon**                                Night**                      Night**

  Sky Cover   30 %          25 %          20 %           35 %         60 %            65 %

  High/Low    74 °F         58 °F         79 °F          55 °F        81 °F           59 °F

  Wind        NW            NW            SW             SW           SW              SE
  Direction                                                                           

  Wind Speed  5 -10         5 -10         5 -10          5 -10        10 - 15         5 -10

  PoP         0             0             0              0            40              60

  Weather     None          None          None           None         Thunderstorms   Showers
  Type                                                                                
  ----------- ------------- ------------- -------------- ------------ --------------- ----------

[]{#__RefHeading___Toc140640295 .anchor}Figure 3. Example Digital Zone
Forecast Product

+----------------+----------------+-----------------+-----------------+
| **XML Data     | **Forecast at  | **Digital       | **Digital Zone  |
| Item**         | a Glance**     | Tabular         | Forecast**      |
|                |                | Forecast**      |                 |
+================+================+=================+=================+
| Title          | Gridpoint      | Gridpoint       | Gridpoint       |
|                | Forecast at a  | Digital Tabular | Digital Zone    |
|                | Glance         | Forecast        | Forecast        |
+----------------+----------------+-----------------+-----------------+
| Creation       | 2003-0         |                 |                 |
| Date/Time      | 9-22T15:30:03Z |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Generator      | DWML Version   |                 |                 |
|                | 1.0            |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Operational    | Experimental   |                 |                 |
| Mode           |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Class          | Meteorological |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Product Type   | Forecast       |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Product Center | Meteorological |                 |                 |
|                | Development    |                 |                 |
|                | Laboratory     |                 |                 |
|                | (W/OST2)       |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Sub-center     | Product        |                 |                 |
|                | Generation     |                 |                 |
|                | Branch         |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Disclaimer URL | http://www.    |                 |                 |
|                | nws.noaa.gov/d |                 |                 |
|                | isclaimer.html |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Credit URL     | http://www     |                 |                 |
|                | .nws.noaa.gov/ |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Credit Logo    | h              |                 |                 |
|                | ttp://www.nws. |                 |                 |
|                | noaa.gov/image |                 |                 |
|                | s/noaaleft.jpg |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Feedback URL   | http://www.nws |                 |                 |
|                | .noaa.gov/mdl/ |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Additional     | <http://ww     |                 |                 |
| Info URL       | w.crh.noaa.gov |                 |                 |
|                | /ifps/MapClick |                 |                 |
|                | .php?site=lwx& |                 |                 |
|                | CiTemplate=1&> |                 |                 |
|                |                |                 |                 |
|                | FcstType=te    |                 |                 |
|                | xt&MapType=0&T |                 |                 |
|                | empBox=1&DewBo |                 |                 |
|                | x=1&WindBox=1& |                 |                 |
|                |                |                 |                 |
|                | ChillBox       |                 |                 |
|                | =1&SkyBox=1&Sn |                 |                 |
|                | owBox=1&FzgBox |                 |                 |
|                | =1&SleetBox=1& |                 |                 |
|                |                |                 |                 |
|                | map.           |                 |                 |
|                | x=187&map.y=60 |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Refresh        | Hourly         |                 |                 |
| Frequency      |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Value Type     | Icon           | Temperature     | Temperature     |
+----------------+----------------+-----------------+-----------------+
| Value Name     | Weather Icon   | Temperature     | Maximum         |
|                |                |                 | Temperature     |
+----------------+----------------+-----------------+-----------------+
| Value Units    | None           | °F              | °F              |
+----------------+----------------+-----------------+-----------------+
| Value          | ![](media      | 79              | 74              |
|                | /image1.jpeg){ |                 |                 |
|                | width="0.76388 |                 |                 |
|                | 88888888888in" |                 |                 |
|                | he             |                 |                 |
|                | ight="0.805555 |                 |                 |
|                | 5555555556in"} |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Spatial        | None           | None            | None            |
| Summarization  |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Temporal       | Period         | Hourly          | Period          |
| Summarization  |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Type of        | Lat/Lon        |                 |                 |
| Geography      |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Horizontal     | 38.0° North    |                 |                 |
| Location       | Lat            |                 |                 |
|                |                |                 |                 |
|                | -78.0° West    |                 |                 |
|                | Lon            |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Vertical       | Surface        |                 |                 |
| Coordinate     |                |                 |                 |
| System         |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Reference Time | 20             |                 |                 |
|                | 03-09-16T12:00 |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Significance   | Start of       |                 |                 |
| of Reference   | Forecast       |                 |                 |
| Time           |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Start of Valid | 2003-0         | 2003-           | 2003-           |
| Time           | 9-16T16:00:00Z | 09-16T16:00:00Z | 09-16T16:00:00Z |
+----------------+----------------+-----------------+-----------------+
| End of Valid   | 2003-0         | 2003-           | 2003-           |
| Time           | 9-17T04:00:00Z | 09-16T17:00:00Z | 09-17T04:00:00Z |
+----------------+----------------+-----------------+-----------------+
| Time           | UTC            |                 |                 |
| Coordinate     |                |                 |                 |
+----------------+----------------+-----------------+-----------------+
| Period Name    | This Afternoon | Not Applicable  | This Afternoon  |
|                | ...            |                 | ...             |
+----------------+----------------+-----------------+-----------------+

[]{#__RefHeading___Toc141760771 .anchor}Table 1. DWML Content by Product

[]{#__RefHeading___Toc170121632 .anchor}**Appendix B: Requirements
Correlation Matrix**

+------------------------+---------+-----------+-----------+----------+
| **Requirement**        | *       | **Spec**  | **Spec**  | **Spec** |
|                        | *Spec** |           |           |          |
+========================+=========+===========+===========+==========+
| **R2.1**               | **S     | **S4.1**  | **S4.2**  |          |
|                        | 3.1.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.1**             | **S     | *         |           |          |
|                        | 4.1.1** | *S4.1.3** |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.2**             | **S     |           |           |          |
|                        | 4.1.6** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.3**             | **S     |           |           |          |
|                        | 3.1.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.4**             | **S     |           |           |          |
|                        | 4.1.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.4.1**           | **S4.   |           |           |          |
|                        | 1.2.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.4.2**           | **S4.   |           |           |          |
|                        | 1.2.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.4.3**           | **S4.   |           |           |          |
|                        | 1.2.3** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.4.4**           | **S4.   |           |           |          |
|                        | 1.2.4** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.5**             | **S     |           |           |          |
|                        | 4.1.4** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.6**             | **S     |           |           |          |
|                        | 4.1.6** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.7**             | **S     |           |           |          |
|                        | 4.2.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.8**             | **S4.   |           |           |          |
|                        | 2.2.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.9**             | **S     |           |           |          |
|                        | 4.2.3** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.10**            | **S     |           |           |          |
|                        | 4.2.4** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.11**            | **S     |           |           |          |
|                        | 4.2.5** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.12**            | **S     |           |           |          |
|                        | 4.2.6** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.13**            | **S     |           |           |          |
|                        | 4.2.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.1.14**            | **S4.   |           |           |          |
|                        | 1.6.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2**               | **S     | **S5.3**  | *         | **       |
|                        | 3.1.3** |           | *S5.3.2** | S5.3.3** |
|                        |         | *         |           |          |
|                        | **S     | *S5.3.5** | *         | **       |
|                        | 5.3.4** |           | *S5.3.6** | S5.3.7** |
|                        |         | *         |           |          |
|                        | **S     | *S5.3.9** | **        | **S      |
|                        | 5.3.8** |           | S5.3.10** | 5.3.11** |
|                        |         | **S5      |           |          |
|                        | **S5.3  | .3.11.3** | **S5      | **S5.    |
|                        | .11.2** |           | .3.11.4** | 3.11.5** |
|                        |         | **S       |           |          |
|                        | *       | 5.3.8.2** |           |          |
|                        | *S5.3.1 |           |           |          |
|                        | 1.4.5** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1**             | **S5.3  | **S5      | **S5      | **S5.    |
|                        | .2.4+** | .3.3.4+** | .3.4.4+** | 3.5.4+** |
|                        |         |           |           |          |
|                        | **S5.3  | **S5      | **S5.3    | **S5.3.8 |
|                        | .6.4+** | .3.7.4+** | .8.2.1+** | .2.1.6** |
|                        |         |           |           |          |
|                        | **S5.3  | **S5      | **S5.3.   | **S5.3.1 |
|                        | .9.4+** | .3.10.2** | 11.2.3+** | 1.3.3+** |
|                        |         |           |           |          |
|                        | **      | **S5.3.11 | **S5.3.   | **S5     |
|                        | S5.3.11 | .4.5.3+** | 11.5.3+** | .3.3.6** |
|                        | .4.3+** |           |           |          |
|                        |         | **S       | **S       | **S5     |
|                        | **S5.   | 5.3.4.6** | 5.3.4.7** | .3.5.6** |
|                        | 3.3.7** |           |           |          |
|                        |         | **S       | **S       | **S5     |
|                        | **S5.   | 5.3.6.6** | 5.3.6.7** | .3.7.6** |
|                        | 3.5.7** |           |           |          |
|                        |         | **S       | **S       | **S5     |
|                        | **S5.   | 5.3.7.8** | 5.3.8.4** | .3.8.5** |
|                        | 3.7.7** |           |           |          |
|                        |         | **S       | **S5.4+** | *        |
|                        | **S5.   | 5.3.9.7** |           | *S5.5+** |
|                        | 3.9.6** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1.1**           | **S5.   | **S       | **S       | **S5     |
|                        | 3.2.1** | 5.3.3.1** | 5.3.4.1** | .3.5.1** |
|                        |         |           |           |          |
|                        | **S5.   | **S       | **S       | **S5.3.  |
|                        | 3.6.1** | 5.3.7.1** | 5.3.9.1** | 11.2.1** |
|                        |         |           |           |          |
|                        | *       | **S5.3    | **S5.3.1  | **S5.3.  |
|                        | *S5.3.1 | .11.4.1** | 1.4.5.1** | 11.5.1** |
|                        | 1.3.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1.2**           | **S5.   | **S       | **S       | **S5     |
|                        | 3.2.5** | 5.3.3.5** | 5.3.4.5** | .3.5.5** |
|                        |         |           |           |          |
|                        | **S5.   | **S       | **S       | **S5.3.  |
|                        | 3.6.5** | 5.3.7.5** | 5.3.9.5** | 11.2.4** |
|                        |         |           |           |          |
|                        | *       | **S5.3    | **S5.3.1  | **S5.3.  |
|                        | *S5.3.1 | .11.4.4** | 1.4.5.4** | 11.5.4** |
|                        | 1.3.4** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1.3**           | **S5.   | **S       | **S       | **S5     |
|                        | 3.2.2** | 5.3.3.2** | 5.3.4.2** | .3.5.2** |
|                        |         |           |           |          |
|                        | **S5.   | **S       | **S5.3.8. | **S5     |
|                        | 3.6.2** | 5.3.7.2** | 2.1.6.1** | .3.9.2** |
|                        |         |           |           |          |
|                        | *       | **S5.3    | **S5.3    | *        |
|                        | *S5.3.1 | .11.3.2** | .11.4.2** | *S5.3.11 |
|                        | 1.2.2** |           |           | .4.5.2** |
|                        |         |           |           |          |
|                        | *       |           |           |          |
|                        | *S5.3.1 |           |           |          |
|                        | 1.5.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1.4**           | **S5.3  | **S5      | **S5      | **S5.    |
|                        | .2.4+** | .3.3.4+** | .3.4.4+** | 3.5.4+** |
|                        |         |           |           |          |
|                        | **S5.3  | **S5      | **S5      | **S5.3.1 |
|                        | .6.4+** | .3.7.4+** | .3.9.4+** | 1.2.3+** |
|                        |         |           |           |          |
|                        | **      | **S5.3.   | **S5.3.11 | **S5.3.1 |
|                        | S5.3.11 | 11.4.3+** | .4.5.3+** | 1.5.3+** |
|                        | .3.3+** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1.5**           | **S5.   | **S       | **S       | **S5     |
|                        | 1.2.1** | 5.1.3.2** | 5.1.4.2** | .1.5.2** |
|                        |         |           |           |          |
|                        | **S5.1. | **S5.     |           |          |
|                        | 6.2.3** | 1.6.3.5** |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.1.6**           | **S     |           |           |          |
|                        | 5.2.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2**             | *       | *         | *         |          |
|                        | *S5.1** | *S5.1.1** | *S5.3.1** |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.1**           | **S     | *         | *         | **       |
|                        | 5.1.2** | *S5.1.3** | *S5.1.4** | S5.1.5** |
|                        |         |           |           |          |
|                        | **S5.   | **S       | **S       |          |
|                        | 1.5.1** | 5.1.5.2** | 5.1.5.3** |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.2**           | **S     | **        | **        | **       |
|                        | 5.1.2** | S5.1.3+** | S5.1.4+** | S5.1.5** |
|                        |         |           |           |          |
|                        | **S5.   | **S       | **S       | **S5     |
|                        | 1.5.1** | 5.1.5.2** | 5.1.5.3** | .1.5.3** |
|                        |         |           |           |          |
|                        | **S5.1. | **S5.1    | **S       |          |
|                        | 5.2.1** | .5.2.2+** | 5.1.5.3.1 |          |
|                        |         |           | --        |          |
|                        |         |           | S5.       |          |
|                        |         |           | 1.5.3.4** |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.3**           | **S5.   | **S       | **S       |          |
|                        | 1.6.1** | 5.1.7.1** | 5.1.8.1** |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.3.1**         | **S     |           |           |          |
|                        | 5.1.6** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.3.1.1**       | **S5.   |           |           |          |
|                        | 1.6.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.3.1.2**       | **S5.   |           |           |          |
|                        | 1.6.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.3.2**         | **S     |           |           |          |
|                        | 5.1.7** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.2.3.3**         | **S     |           |           |          |
|                        | 5.1.8** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.3**             | *       | **S5.2.3  | **S       | **S5     |
|                        | *S5.2** | --        | 5.3.2.3** | .3.3.3** |
|                        |         | S5.2.5**  |           |          |
|                        | **S5.   |           | **S       | **S5     |
|                        | 3.4.3** | **S       | 5.3.6.3** | .3.7.3** |
|                        |         | 5.3.5.3** |           |          |
|                        | **S5.   |           | **S5      | **S5.    |
|                        | 3.8.1** | **S       | .3.10.1** | 3.11.1** |
|                        |         | 5.3.9.3** |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.3.1**           | **S     |           |           |          |
|                        | 5.2.4** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.3.2**           | **S     |           |           |          |
|                        | 5.2.5** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.3.3**           | **S     |           |           |          |
|                        | 5.2.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R2.2.3.4**           | **S5.   |           |           |          |
|                        | 2.4.1** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R3.1**               | **ALL** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R3.2**               | *       |           |           |          |
|                        | *S7.2** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R3.3**               | *       |           |           |          |
|                        | *S7.3** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R4.1**               | **ALL** |           |           | **\`**   |
+------------------------+---------+-----------+-----------+----------+
| **R4.2**               | **ALL** |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R5.1**               | **A     |           |           |          |
|                        | ppendix |           |           |          |
|                        | D**     |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R5.2**               | **A     |           |           |          |
|                        | ppendix |           |           |          |
|                        | D**     |           |           |          |
+------------------------+---------+-----------+-----------+----------+
| **R5.3**               | **A     |           |           |          |
|                        | ppendix |           |           |          |
|                        | D**     |           |           |          |
+------------------------+---------+-----------+-----------+----------+

[]{#__RefHeading___Toc170121633 .anchor}**Appendix C: Data Model**

[]{#__RefHeading___Toc170121634 .anchor}**Appendix D: Product Samples**

[]{#__RefHeading___Toc170121635 .anchor}**Forecast at a Glance**

The grid point forecast [(on-line
example)](http://www.crh.noaa.gov/ifps/MapClick.php?site=lwx&CiTemplate=1&FcstType=text&MapType=0&TempBox=1&DewBox=1&WindBox=1&ChillBox=1&SkyBox=1&SnowBox=1&FzgBox=1&SleetBox=1&map.x=186&map.y=60)
contains the high or low temperature, the sky condition, and a weather
icon. Figure 4 shows an example of the experimental forecast product.

[]{#__RefHeading___Toc170121636 .anchor}NWS Web Site Product

+---------+---------+---------+---------+---------+---------+---------+
| **This  | **To    | **Sat   | **S     | **S     | *       | **M     |
| Afte    | night** | urday** | aturday | unday** | *Sunday | onday** |
| rnoon** |         |         | Night** |         | Night** |         |
+---------+---------+---------+---------+---------+---------+---------+
| ![      | ![      | ![      | ![      | ![      | ![      | ![      |
| ](media | ](media | ](media | ](media | ](media | ](media | ](media |
| /image1 | /image2 | /image3 | /image4 | /image1 | /image2 | /image5 |
| .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ | .jpeg){ |
| width=" | width=" | width=" | width=" | width=" | width=" | width=" |
| 0.75972 | 0.76388 | 0.76388 | 0.76388 | 0.76388 | 0.76388 | 0.76388 |
| 2222222 | 8888888 | 8888888 | 8888888 | 8888888 | 8888888 | 8888888 |
| 2222in" | 8888in" | 8888in" | 8888in" | 8888in" | 8888in" | 8888in" |
| he      | he      | he      | he      | he      | he      | he      |
| ight="0 | ight="0 | ight="0 | ight="0 | ight="0 | ight="0 | ight="0 |
| .802083 | .805555 | .805555 | .805555 | .805555 | .805555 | .805555 |
| 3333333 | 5555555 | 5555555 | 5555555 | 5555555 | 5555555 | 5555555 |
| 334in"} | 556in"} | 556in"} | 556in"} | 556in"} | 556in"} | 556in"} |
+---------+---------+---------+---------+---------+---------+---------+
| Partly  | Partly  | Mostly  | Mostly  | Partly  | Partly  | Partly  |
| Cloudy  | Cloudy  | Cloudy  | Clear   | Cloudy  | Cloudy  | Cloudy  |
|         |         |         |         |         |         |         |
| Hi 74   | Lo 58   | Hi 79   | Lo 55   | Hi 81   | Lo 59   | Hi 77   |
| °F      | °F      | °F      | °F      | °F      | °F      | °F      |
+---------+---------+---------+---------+---------+---------+---------+

[]{#__RefHeading___Toc140640296 .anchor}Figure 4. Forecast at a Glance

[]{#__RefHeading___Toc170121637 .anchor}**Analogous DWML**

\<dwml version="1.0"\>

\<head\>

\<product srsName="WGS 1984" concise-name="glance"
operational-mode="official"\>

\<title\>NWS Forecast at a Glance\</product-title\>

\<field\>meteorological\</field\>

\<category\>forecast\</category\>\</

\<creation-date refresh-frequency="P1H"\>
2003-10-22T15:30:03Z\</creation-date\>

\</product\>

\<source\>

\<more-information\>[http://www.crh.noaa.gov/ifps/MapClick.php](http://www.crh.noaa.gov/ifps/MapClick.php?site=lwx&CiTemplate=1&FcstType=text&MapType=0&TempBox=1&DewBox=1&WindBox=1&ChillBox=1&SkyBox=1&SnowBox=1&FzgBox=1&SleetBox=1&map.x=187&map.y=60)\</more-information\>

\<production-center\>Meteorological Development Laboratory,
\<sub-center\>Statistical Modeling

Branch\</sub-center\>\</production-center\>

\</production-center\>

\<disclaimer\><http://www.nws.noaa.gov/disclaimer.html>\</disclaimer\>

\<credit\><http://www.nws.noaa.gov/>\</credit\>

\<credit-logo\><http://www.nws.noaa.gov/images/noaaleft.jpg>\</credit-logo\>

\<feedback\><http://www.nws.noaa.gov/mdl/>\</feedback\>

\</source\>

\</head\>

\<data\>

\<location\>

\<location-key\>point1\</location-key\>

\<point latitude="38.0" longitude="-78.0"/\>

\</location\>

\<time-layout time-coordinate="local time" summarization="none"\>

\<layout-key\>k-p12h-n4-1\</layout-key\>

\<start-valid-time period-name="This
Afternoon"\>2003-10-15T12:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-15T23:59:59-05:00\</end-valid-time\>

\<start-valid-time
period-name="Saturday"\>2003-10-16T12:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-16T23:59:59-05:00\</end-valid-time\>

\<start-valid-time
period-name="Sunday"\>2003-10-17T12:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-17T23:59:59-05:00\</end-valid-time\>

\<start-valid-time
period-name="Monday"\>2003-10-18T12:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-18T23:59:59-05:00\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="local time" summarization="none"\>

\<layout-key\>k-p13h-n3-2\</layout-key\>

\<start-valid-time
period-name="Tonight"\>2003-10-16T00:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-16T12:59:59-05:00\</end-valid-time\>

\<start-valid-time period-name="Saturday
Night"\>2003-10-17T00:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-17T12:59:59-05:00\</end-valid-time\>

\<start-valid-time period-name="Sunday
Night"\>2003-10-18T00:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-18T12:59:59-05:00\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="local time" summarization="mean"\>

\<layout-key\>k-p12h-n7-3\</layout-key\>

\<start-valid-time period-name="This
Afternoon"\>2003-10-15T16:00:00-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-15T21:59:59-04:00\</end-valid-time\>

\<start-valid-time
period-name="Tonight"\>2003-10-15T22:00:00-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-16T09:59:59-04:00\</end-valid-time\>

\<start-valid-time
period-name="Saturday"\>2003-10-16T10:00:00-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-16T21:59:59-04:00\</end-valid-time\>

\<start-valid-time
period-name="Saturday-Night"\>2003-10-16T22:00:00-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-17T09:59:59-04:00\</end-valid-time\>

\<start-valid-time
period-name="Sunday"\>2003-10-17T10:00:00-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-17T21:59:59-04:00\</end-valid-time\>

\<start-valid-time
period-name="Sunday-Night"\>2003-10-17T22:00:00-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-18T09:59:59-04:00\</end-valid-time\>

\<start-valid-time
period-name="Monday"\>2003-10-18T10:00:01-04:00\</start-valid-time\>

\<end-valid-time\>2003-10-19T21:59:59-04:00\</end-valid-time\>

\</time-layout\>

\<parameters applicable-location='point1'\>

\<conversion-definitions\>

\<conversion-table units="percent"\>

\<conversion-key\>sky-cover\</conversion-key\>

\<start-value\>0\</start-value\>

\<end-value\>6\</end-value\>

\<equivalent-value\>clear\</equivalent-value\>

\<start-value\>7\</start-value\>

\<end-value\>31\</end-value\>

\<equivalent-value\>mostly clear\</equivalent-value\>

\<start-value\>32\</start-value\>

\<end-value\>69\</end-value\>

\<equivalent-value\>partly cloudy\</equivalent-value\>

\<start-value\>70\</start-value\>

\<end-value\>94\</end-value\>

\<equivalent-value\>mostly cloudy\</equivalent-value\>

\<start-value\>95\</start-value\>

\<end-value\>100\</end-value\>

\<equivalent-value\>cloudy\</equivalent-value\>

\</conversion-table\>

\</conversion-definitions\>

\<temperature type="maximum" units="F" time-layout="k-p12h-n4-1"\>

\<name\>Maximum Temperature\</name\>

\<value\>74\</value\>

\<value\>79\</value\>

\<value\>81\</value\>

\<value\>77\</value\>

\</temperature\>

\<temperature type="minimum" units="F" time-layout="k-p12h-n3-2"\>

\<name\>Minimum Temperature\</name\>

\<value\>58\</value\>

\<value\>59\</value\>

\<value\>55\</value\>

\</temperature\>

\<cloud-amount type="total" units="percent" time-layout=" k-p12h-n7-3"
conversion-table="sky-cover"\>

\<amount-name\>Total Sky Cover\</amount-name\>

\<amount-name\>45\</amount-name\>

\<amount-name\>75\</amount-name\>

\<amount-name\>55\</amount-name\>

\<amount-name\>60\</amount-name\>

\<amount-name\>50\</amount-name\>

\<amount-name\>77\</amount-name\>

\<amount-name\>53\</amount-name\>

\</cloud-amount\>

\<conditions-icons time-layout=" k-p12h-n7-3"\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/nsct.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/nbkn.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/tsra20.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/tsra40.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/tsra40.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/tsra40.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/tsra40.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/ntsra20.jpg\</icon-link\>

\<icon-link\>http://www.nws.noaa.gov/weather/images/fcicons/hi_nshwrs20.jpg\</icon-link\>

\</conditions-icons\>

\</parameters\>

\</data\>

\</dwml\>

[]{#__RefHeading___Toc170121638 .anchor}**Digital Tabular Forecast**

The forecast [(on-line
example)](http://www.crh.noaa.gov/ifps/MapClick.php?FcstType=digital&map.x=186&map.y=60&site=lwx&Radius=0&CiTemplate=0)
contains hourly values for temperature, dew point temperature,
probability of precipitation, wind direction and speed, sky cover, as
well as precipitation type information. Figure 5 shows an example of
this experimental forecast product.

[]{#__RefHeading___Toc170121639 .anchor}**Sample Digital Tabular
Forecast Product**

![](media/image6.wmf)

[]{#__RefHeading___Toc140640297 .anchor}Figure 5. Digital/Tabular
Forecast

[]{#__RefHeading___Toc170121640 .anchor}**Analogous DWML**

\<dwml version="1.0"\>

\<head\>

\<product srsName="WGS 1984" concise-name=" digital-tabular"
operational-mode="official"\>

\<title\>NWS Forecast at a Glance\</product-title\>

\<field\>meteorological\</field\>

\<category\>forecast\</category\>

\<creation-date refresh-frequency="P1H"\>
2003-10-22T15:30:03Z\</creation-date\>

\</product\>

\<source\>

\<more-information\>[http://www.crh.noaa.gov/ifps/MapClick.php](http://www.crh.noaa.gov/ifps/MapClick.php?site=lwx&CiTemplate=1&FcstType=text&MapType=0&TempBox=1&DewBox=1&WindBox=1&ChillBox=1&SkyBox=1&SnowBox=1&FzgBox=1&SleetBox=1&map.x=187&map.y=60)\</more-information\>

\<production-center\>Meteorological Development Laboratory,
\<sub-center\>Statistical Modeling

Branch\</sub-center\>\</production-center\>

\</production-center\>

\<disclaimer\><http://www.nws.noaa.gov/disclaimer.html>\</disclaimer\>

\<credit\><http://www.nws.noaa.gov/>\</credit\>

\<credit-logo\><http://www.nws.noaa.gov/images/noaaleft.jpg>\</credit-logo\>

\<feedback\><http://www.nws.noaa.gov/mdl/>\</feedback\>

\</source\>

\</head\>

\<data\>

\<location\>

\<location-key\>point1\</location-key\>

\<point latitude="38.0" longitude="-78.0"/\>

\</location\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p1h-n16-1\</layout-key\>

\<start-valid-time\>2003-09-16T20:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T21:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T22:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T23:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T00:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T01:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T02:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T03:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T04:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T05:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T06:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T07:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T08:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T09:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T10:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-09-16T11:00:00Z\</start-valid-time\>

\</time-layout\>

\<parameters applicable-location='point1'\>

\<conversion-definitions\>

\<conversion-table\>

\<conversion-key\>wind-direction\</conversion-key\>

\<start-value\>23\</start-value\>

\<end-value\>67\</end-value\>

\<equivalent-value\>NE\</equivalent-value\>

\<start-value\>68\</start-value\>

\<end-value\>112\</end-value\>

\<equivalent-value\>E\</equivalent-value\>

\<start-value\>113\</start-value\>

\<end-value\>157\</end-value\>

\<equivalent-value\>SE\</equivalent-value\>

\<start-value\>158\</start-value\>

\<end-value\>202\</end-value\>

\<equivalent-value\>SE\</equivalent-value\>

\<start-value\>203\</start-value\>

\<end-value\>247\</end-value\>

\<equivalent-value\>SW\</equivalent-value\>

\<start-value\>248\</start-value\>

\<end-value\>292\</end-value\>

\<equivalent-value\>W\</equivalent-value\>

\<start-value\>293\</start-value\>

\<end-value\>337\</end-value\>

\<equivalent-value\>NW\</equivalent-value\>

\<start-value\>338\</start-value\>

\<end-value\>22\</end-value\>

\<equivalent-value\>N\</equivalent-value\>

\</conversion-table\>

\</conversion-definitions\>

\<temperature type="temperature" units="F" time-layout="k-p1h-n16-1"\>

\<name\>Hourly Temperatures\</name\>

\<value\>79\</value\>

\<value\>79\</value\>

\<value\>78\</value\>

\<value\>75\</value\>

\<value\>72\</value\>

\<value\>70\</value\>

\<value\>67\</value\>

\<value\>65\</value\>

\<value\>62\</value\>

\<value\>59\</value\>

\<value\>58\</value\>

\<value\>58\</value\>

\<value\>57\</value\>

\<value\>57\</value\>

\<value\>56\</value\>

\<value\>56\</value\>

\</temperature\>

\<temperature type="dew point" units="F" time-layout="k-p1h-n16-1"\>

\<name\>Hourly Dewpoint Temperatures\</name\>

\<value\>52\</value\>

\<value\>51\</value\>

\<value\>50\</value\>

\<value\>50\</value\>

\<value\>49\</value\>

\<value\>48\</value\>

\<value\>48\</value\>

\<value\>47\</value\>

\<value\>46\</value\>

\<value\>46\</value\>

\<value\>46\</value\>

\<value\>46\</value\>

\<value\>46\</value\>

\<value\>47\</value\>

\<value\>48\</value\>

\<value\>48\</value\>

\</temperature\>

\<probability-of-precipitation type="12 hour" units="percent"
time-layout="k-p1h-n16-1"\>

\<name\>12 Hour Probability of Precipitation\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\</probability-of-precipitation\>

\<cloud-amount type="total" units="percent" time-layout="k-p1h-n16-1"\>

\<amount-name\>Total Sky Cover\</amount -name\>

\<value\>13\</value\>

\<value\>10\</value\>

\<value\>6\</value\>

\<value\>3\</value\>

\<value\>2\</value\>

\<value\>2\</value\>

\<value\>2\</value\>

\<value\>2\</value\>

\<value\>3\</value\>

\<value\>5\</value\>

\<value\>7\</value\>

\<value\>9\</value\>

\<value\>10\</value\>

\<value\>12\</value\>

\<value\>14\</value\>

\<value\>16\</value\>

\</cloud-amount\>

\<direction type="wind" units="degrees true" time-layout="k-p1h-n16-1"
conversion-table="wind-direction"\>

\<name\>Wind Direction\</name\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\<value\>315\</value\>

\</direction\>

\<wind-speed type="sustained" units="knots" time-layout="k-p1h-n16-1"\>

\<name\>Sustained Wind Speed\</name\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>6\</value\>

\<value\>3\</value\>

\<value\>2\</value\>

\<value\>2\</value\>

\<value\>2\</value\>

\<value\>3\</value\>

\<value\>5\</value\>

\<value\>5\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\</wind-speed\>

\<wind-speed type="gust" units="knots" time-layout="k-p1h-n16-1"\>

\<name\>Wind SpeedGusts\</name\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value\>5\</value\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\<value xsi:nil="true"/\>

\</wind-speed\>

\<weather time-layout="k-p1h-n16-1"\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\<weather-conditions xsi:nil="true"/\>

\</weather\>

\</parameters\>

\</data\>

\</dwml\>

[]{#__RefHeading___Toc170121641 .anchor}**Digital Zone Forecast**

This product is similar to the Forecast at a Glance in that it uses 12
hour forecast periods to summarize the NDFD data. The digital zone
forecast is like the Digital Tabular Forecast in terms of its use of an
extensive number of weather elements. Figure 6 shows an example product.

[]{#__RefHeading___Toc170121642 .anchor}**Sample Digital Zone Forecast
Product**

  ------------------------------ ------------- ------------- -------------- ------------ --------------- ----------
                                 **This        **Tonight**   **Saturday**   **Saturday   **Sunday**      **Sunday
                                 Afternoon**                                Night**                      Night**

  Sky Cover                      30 percent    25 percent    20 percent     35 percent   60 percent      65 percent

  High/Low                       74 °F         58 °F         79 °F          55 °F        81 °F           59 °F

  Wind Direction                 NW            NW            SW             SW           SW              SE

  Wind Speed                     5 -10         5 -10         5 -10          5 -10        10 - 15         5 -10

  Probability-of-precipitation   0             0             0              0            40              60

  Weather Type                   None          None          None           None         Thunderstorms   Showers
  ------------------------------ ------------- ------------- -------------- ------------ --------------- ----------

[]{#__RefHeading___Toc140640298 .anchor}Figure 6. Digital Zone Forecast

[]{#__RefHeading___Toc170121643 .anchor}**Analogous DWML**

\<dwml version="1.0"\>

\<head\>

\<product srsName="WGS 1984" concise-name="digital-zone"
operational-mode="official"\>

\<creation-date refresh-frequency="P1H"\>
2003-10-22T15:30:03Z\</creation-date\>

\</product\>

\<source\>

\<more-information\>[http://www.crh.noaa.gov/ifps/MapClick.php](http://www.crh.noaa.gov/ifps/MapClick.php?site=lwx&CiTemplate=1&FcstType=text&MapType=0&TempBox=1&DewBox=1&WindBox=1&ChillBox=1&SkyBox=1&SnowBox=1&FzgBox=1&SleetBox=1&map.x=187&map.y=60)\</more-information\>

\</source\>

\</head\>

\<data\>

\<location\>

\<location-key\>point1\</location-key\>

\<point latitude="38.0" longitude="-78.0"/\>

\</location\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p12h-n3-1\</layout-key\>

\<start-valid-time period-name="This
Afternoon"\>2003-10-15T12:00:00Z\</start-valid-time\>

\<end-valid-time\>2003-10-16T23:59:59Z\</end-valid-time\>

\<start-valid-time
period-name="Saturday"\>2003-10-16T12:00:00Z\</start-valid-time\>

\<end-valid-time\>2003-10-17T23:59:59Z\</end-valid-time\>

\<start-valid-time
period-name="Sunday"\>2003-10-17T12:00:00Z\</start-valid-time\>

\<end-valid-time\>2003-10-18T23:59:59Z\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="local-time" summarization="none"\>

\<layout-key\>k-p12h-n3-2\</layout-key\>

\<start-valid-time
period-name="Tonight"\>2003-10-16T00:00:00Z\</start-valid-time\>

\<end-valid-time\>2003-10-16T11:59:59Z\</end-valid-time\>

\<start-valid-time period-name="Saturday Night"\>
2003-10-17T00:00:00Z\</start-valid-time\>

\<end-valid-time\>2003-10-17T11:59:59Z \</end-valid-time\>

\<start-valid-time period-name="Sunday Night"\>
2003-10-18T00:00:00Z\</start-valid-time\>

\<end-valid-time\>2003-10-18T11:59:59Z \</end-valid-time\>

\</time-layout\>

\<parameters applicable-location='point1'\>

\<conversion-definitions\>

\<conversion-table\>

\<conversion-key\>wind-direction\</conversion-key\>

\<start-value\>23\</start-value\>

\<end-value\>67\</end-value\>

\<equivalent-value\>NE\</equivalent-value\>

\<start-value\>68\</start-value\>

\<end-value\>112\</end-value\>

\<equivalent-value\>E\</equivalent-value\>

\<start-value\>113\</start-value\>

\<end-value\>157\</end-value\>

\<equivalent-value\>SE\</equivalent-value\>

\<start-value\>158\</start-value\>

\<end-value\>202\</end-value\>

\<equivalent-value\>SE\</equivalent-value\>

\<start-value\>203\</start-value\>

\<end-value\>247\</end-value\>

\<equivalent-value\>SW\</equivalent-value\>

\<start-value\>248\</start-value\>

\<end-value\>292\</end-value\>

\<equivalent-value\>W\</equivalent-value\>

\<start-value\>293\</start-value\>

\<end-value\>337\</end-value\>

\<equivalent-value\>NW\</equivalent-value\>

\<start-value\>338\</start-value\>

\<end-value\>22\</end-value\>

\<equivalent-value\>N\</equivalent-value\>

\</conversion-table\>

\</conversion-definitions\>

\<temperature type="maximum" units="F" time-layout="k-p12h-n3-1"\>

\<value\>74\</value\>

\<value\>79\</value\>

\<value\>81\</value\>

\</temperature\>

\<temperature type="minimum" units="F" time-layout="k-p12h-n3-2"\>

\<value\>58\</value\>

\<value\>55\</value\>

\<value\>59\</value\>

\</temperature\>

\<cloud-amount type="total" units="percent" time-layout="k-p12h-n3-1"\>

\<name\>Total Sky Cover\</ name\>

\<value\>30\</value\>

\<value\>20\</value\>

\<value\>60\</value\>

\</cloud-amount\>

\<cloud-amount type="total" units="percent" time-layout="k-p12h-n3-2"\>

\<name\>Total Sky Cover\</ name\>

\<value\>25\</value\>

\<value\>35\</value\>

\<value\>65\</value\>

\</cloud-amount\>

\<direction type="wind" units="degrees true" time-layout="k-p12h-n3-1"
conversion-table="wind-direction"\>

\<value\>315\</value\>

\<value\>225\</value\>

\<value\>225\</value\>

\</direction\>

\<direction type="wind" units="degrees true" time-layout="k-p12h-n3-2"
conversion-table="wind-direction"\>

\<value\>315\</value\>

\<value\>135\</value\>

\<value\>225\</value\>

\</direction\>

\<wind-speed type="sustained" units="knots" time-layout="k-p12h-n3-1"\>

\<value lower-range="5" upper-range="10"\>6\</value\>

\<value lower-range="5" upper-range="10"\>8\</value\>

\<value lower-range="10" upper-range="15"\>12\</value\>

\</wind-speed\>

\<wind-speed type="sustained" units="knots" time-layout="k-p12h-n3-2"\>

\<value lower-range="5" upper-range="10"\>6\</value\>

\<value lower-range="5" upper-range="10"\>8\</value\>

\<value lower-range="5" upper-range="10"\>7\</value\>

\</wind-speed\>

\<probability-of-precipitation type="12-hour" units="percent"
time-layout="k-p12h-n3-1"\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>40\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="12-hour" units="percent"
time-layout="k-p12h-n3-2"\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>60\</value\>

\</probability-of-precipitation\>

\<weather time-layout=" k-p12h-n3-1"\>

\<weather-conditions xsi:nil="true" /\>

\<weather-conditions xsi:nil="true" /\>

\<weather-conditions\>

\<value coverage="scattered" intensity="moderate"
weather-type="thunderstorms" qualifier="none" /\>

\</weather-conditions\>

\</weather\>

\<weather time-layout=" k-p12h-n3-2"\>

\<weather-conditions xsi:nil="true" /\>

\<weather-conditions xsi:nil="true" /\>

\<weather-conditions\>

\<value coverage="chance" intensity="light" weather-type="showers"
qualifier="none" /\>

\</weather-conditions\>

\</weather\>

\</parameters\>

\<data\>

\<dwml\>

[]{#__RefHeading___Toc170121644 .anchor}**Model Output Statistics
Bulletin**

This is not an NDFD product. Rather, it is an operational text bulletin
produced by the Meteorological Development Laboratory. Figure 7 shows a
sample bulletin.

[]{#__RefHeading___Toc170121645 .anchor}**Sample Model Output Statistics
Product**

[]{#__RefHeading___Toc140640299 .anchor}Figure 7: Sample Model Output
Statistics Bulletin.

[]{#__RefHeading___Toc170121646 .anchor}**Analogous DWML**

\<dwml version="1.0"\>

\<head\>

\<product srsName="WGS 1984" concise-name=" digital-tabular"
operational-mode="experimental"\>

\<title\>NWS Forecast at a Glance\</product-title\>

\<field\>meteorological\</field\>

\<category\>forecast\</category\>

\<creation-date refresh-frequency="P1H"\>
2003-10-24T10:30:03Z\</creation-date\>

\</product\>

\<source\>

\<more-information\>http://www.nws.noaa.gov/mdl/synop/products.shtml\</more-information\>

\<production-center\>Meteorological Development Laboratory,
\<sub-center\>Statistical Modeling

Branch\</sub-center\>\</production-center\>

\<disclaimer\><http://www.nws.noaa.gov/disclaimer.html>\</disclaimer\>

\<credit\><http://www.nws.noaa.gov/>\</credit\>

\<credit-logo\><http://www.nws.noaa.gov/images/noaaleft.jpg>\</credit-logo\>

\<feedback\><http://www.nws.noaa.gov/mdl/>\</feedback\>

\</source\>

\</head\>

\<data\>

\<location\>

\<location-key\>point1\</location-key\>

\<point latitude="36.9872" longitude="-77.0011"/\>

\</location\>

\<time-layout time-coordinate="local-time" summarization="none"\>

\<layout-key\>k-p12h-n2-1\</layout-key\>

\<start-valid-time\>2003-10-25T12:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-25T23:59:59-05:00\</end-valid-time\>

\<start-valid-time\>2003-10-26T12:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-26T23:59:59-05:00\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="local time" summarization="none"\>

\<layout-key\>k-p13h-n3-2\</layout-key\>

\<start-valid-time\>2003-10-25T00:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-25T12:59:59-05:00\</end-valid-time\>

\<start-valid-time\>2003-10-26T00:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-26T12:59:59-05:00\</end-valid-time\>

\<start-valid-time\>2003-10-27T00:00:00-05:00\</start-valid-time\>

\<end-valid-time\>2003-10-27T12:59:59-05:00\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p3h-n21-3\</layout-key\>

\<start-valid-time\>2003-10-24T18:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-24T21:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T00:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T03:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T06:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T09:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T12:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T15:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T18:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-25T21:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T00:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T03:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T06:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T09:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T12:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T15:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T18:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-26T21:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-27T00:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-27T06:00:00Z\</start-valid-time\>

\<start-valid-time\>2003-10-27T12:00:00Z\</start-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p6h-n11-4\</layout-key\>

\<start-valid-time\>2003-10-24T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T12:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T12:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T18:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T12:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T12:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T18:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-27T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-27T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T12:00:00Z\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p12h-n5-5\</layout-key\>

\<start-valid-time\>2003-10-25T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T12:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T12:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T12:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T12:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-27T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T12:00:00Z\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p6h-n10-6\</layout-key\>

\<start-valid-time\>2003-10-24T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T12:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T12:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T18:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T12:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T12:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T18:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T00:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-27T00:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T06:00:00Z\</end-valid-time\>

\</time-layout\>

\<time-layout time-coordinate="UTC" summarization="none"\>

\<layout-key\>k-p12h-n5-7\</layout-key\>

\<start-valid-time\>2003-10-24T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-25T18:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-25T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T06:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T06:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-26T18:00:00Z\</end-valid-time\>

\<start-valid-time\>2003-10-26T18:00:01Z\</start-valid-time\>

\<end-valid-time\>2003-10-27T06:00:00Z\</end-valid-time\>

\</time-layout\>

\<parameters applicable-location='point1'\>

\<categorical-definitions\>

\<categorical-table units="inches"\>

\<categorical-key\>QPF-categories\</categorical-key\>

\<value category="no precipitation"\>0\</value\>

\<value category="0.01 to 0.09"\>1\</value\>

\<value category="0.10 to 0.24"\>2\</value\>

\<value category="0.25 to 0.49"\>3\</value\>

\<value category="0.50 to 0.99"\>4\</value\>

\<value category="1.00 to 1.99"\>5\</value\>

\<value category="2.00 inches or greater"\>6\</value\>

\</categorical-table\>

\<categorical-table units="miles"\>

\<categorical-key\>visibility-categories\</categorical-key\>

\<value category="less than or equal to 1/4"\>1\</value\>

\<value category="1/4 to 1/2"\>2\</value\>

\<value category="1/2 to 1"\>3\</value\>

\<value category="1 to 3"\>4\</value\>

\<value category="3 to 5"\>5\</value\>

\<value category="6"\>6\</value\>

\<value category="greater than 6"\>7\</value\>

\</categorical-table\>

\<categorical-table units="feet"\>

\<categorical-key\>ceiling-categories\</categorical-key\>

\<value category="less than 200"\>1\</value\>

\<value category="200 to 400"\>2\</value\>

\<value category="500 to 900"\>3\</value\>

\<value category="1000 to 3000"\>4\</value\>

\<value category="3100 to 6500"\>5\</value\>

\<value category="6600 to 12000"\>6\</value\>

\<value category="greater than 12000"\>7\</value\>

\</categorical-table\>

\</categorical-definitions\>

\<conversion-definitions\>

\<conversion-table\>

\<conversion-key\>sky-cover\</conversion-key\>

\<start-value\>0\</start-value\>

\<end-value\>0\</end-value\>

\<equivalent-value\>CL\</equivalent-value\>

\<start-value\>3\</start-value\>

\<end-value\>4\</end-value\>

\<equivalent-value\>SC\</equivalent-value\>

\<start-value\>5\</start-value\>

\<end-value\>7\</end-value\>

\<equivalent-value\>BK\</equivalent-value\>

\<start-value\>8\</start-value\>

\<end-value\>8\</end-value\>

\<equivalent-value\>OV\</equivalent-value\>

\</conversion-table\>

\</conversion-definitions\>

\<temperature type="maximum" units="F" time-layout="k-p12h-n2-1"\>

\<name\>Maximum Temperature\</name\>

\<value\>62\</value\>

\<value\>70\</value\>

\</temperature\>

\<temperature type="minimum" units="F" time-layout="k-p12h-n3-2"\>

\<name\>Minimum Temperature\</name\>

\<value\>38\</value\>

\<value\>57\</value\>

\<value\>59\</value\>

\</temperature\>

\<temperature type="temperature" units="F" time-layout="k-p12h-n21-3"\>

\<name\>3 Hourly Temperature\</name\>

\<value\>57\</value\>

\<value\>57\</value\>

\<value\>44\</value\>

\<value\>41\</value\>

\<value\>40\</value\>

\<value\>40\</value\>

\<value\>41\</value\>

\<value\>55\</value\>

\<value\>60\</value\>

\<value\>60\</value\>

\<value\>56\</value\>

\<value\>58\</value\>

\<value\>60\</value\>

\<value\>60\</value\>

\<value\>60\</value\>

\<value\>65\</value\>

\<value\>68\</value\>

\<value\>67\</value\>

\<value\>63\</value\>

\<value\>64\</value\>

\<value\>64\</value\>

\</temperature\>

\<temperature type="dew point" units="F" time-layout="k-p12h-n21-3"\>

\<name\>3 Hourly Dew Point Temperature\</name\>

\<value\>27\</value\>

\<value\>29\</value\>

\<value\>36\</value\>

\<value\>35\</value\>

\<value\>35\</value\>

\<value\>36\</value\>

\<value\>39\</value\>

\<value\>46\</value\>

\<value\>49\</value\>

\<value\>52\</value\>

\<value\>54\</value\>

\<value\>57\</value\>

\<value\>59\</value\>

\<value\>59\</value\>

\<value\>59\</value\>

\<value\>61\</value\>

\<value\>61\</value\>

\<value\>61\</value\>

\<value\>60\</value\>

\<value\>59\</value\>

\<value\>60\</value\>

\</temperature\>

\<cloud-amount type="total" units="8ths" time-layout="k-p3h-n21-3"
conversion-table="sky-cover"\>

\<name\>Total Sky Amount\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>6\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\<value\>8\</value\>

\</cloud-amount\>

\<direction type="wind" units="degrees true" time-layout="k-p3h-n21-3"\>

\<name\>10 Meter Wind Direction\</name\>

\<value\>360\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>190\</value\>

\<value\>210\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>200\</value\>

\<value\>210\</value\>

\<value\>210\</value\>

\<value\>210\</value\>

\<value\>210\</value\>

\<value\>220\</value\>

\<value\>220\</value\>

\<value\>220\</value\>

\<value\>180\</value\>

\<value\>230\</value\>

\</direction\>

\<wind-speed type="sustained" units="knots" time-layout="k-p3h-n21-3"\>

\<name\>10 Meter Wind Speed\</name\>

\<value\>2\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>5\</value\>

\<value\>5\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>2\</value\>

\<value\>2\</value\>

\<value\>3\</value\>

\<value\>3\</value\>

\<value\>6\</value\>

\<value\>5\</value\>

\<value\>2\</value\>

\<value\>3\</value\>

\<value\>4\</value\>

\<value\>6\</value\>

\</wind-speed\>

\<probability-of-precipitation type="6 hour" units="percent"
time-layout="k-p6h-n11-4"\>

\<name\>6 Hour Probability of Precipitation\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>3\</value\>

\<value\>2\</value\>

\<value\>11\</value\>

\<value\>20\</value\>

\<value\>32\</value\>

\<value\>35\</value\>

\<value\>20\</value\>

\<value\>57\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="12 hour" units="percent"
time-layout=" k-p12h-n5-5"\>

\<name\>12 Hour Probability of Precipitation\</name\>

\<value\>0\</value\>

\<value\>10\</value\>

\<value\>22\</value\>

\<value\>59\</value\>

\<value\>60\</value\>

\</probability-of-precipitation\>

\<precipitation type="6 hour" time-layout="k-p6h-n11-4"
categorical-table="QPF-categories"\>

\<name\>6 Hour Precipitation\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>2\</value\>

\</precipitation\>

\<precipitation type="12 hour" time-layout=" k-p12h-n5-5"
categorical-table="QPF-categories"\>

\<name\>12 Hour Precipitation\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>1\</value\>

\<value\>2\</value\>

\</precipitation\>

\<probability-of-precipitation type="6 hour thunderstorm"
units="percent" time-layout="k-p6h-n10-6"\>

\<name\>6 Hour Probability of Thunderstorms\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>2\</value\>

\<value\>3\</value\>

\<value\>2\</value\>

\<value\>6\</value\>

\<value\>18\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="12 hour thunderstorm"
units="percent" time-layout=" k-p12h-n5-7"\>

\<name\>12 Hour Probability of Thunderstorms\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>2\</value\>

\<value\>5\</value\>

\<value\>18\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="6 hour severe thunderstorm"
units="percent" time-layout="k-p6h-n10-6"\>

\<name\>6 Hour Conditional Probability of Severe Thunderstorms\</name\>

\<value\>24\</value\>

\<value\>19\</value\>

\<value\>0\</value\>

\<value\>27\</value\>

\<value\>19\</value\>

\<value\>19\</value\>

\<value\>0\</value\>

\<value\>30\</value\>

\<value\>25\</value\>

\<value\>1\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="12 hour severe thunderstorm"
units="percent" time-layout=" k-p12h-n5-7"\>

\<name\>12 Hour Conditional Probability of Severe Thunderstorms\</name\>

\<value\>29\</value\>

\<value\>27\</value\>

\<value\>32\</value\>

\<value\>30\</value\>

\<value\>40\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="freezing" units="percent"
time-layout="k-p3h-n21-3"\>

\<name\>3 Hour Probability of Freezing Precipitation\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\</probability-of-precipitation\>

\<probability-of-precipitation type="snow" units="percent"
time-layout="k-p3h-n21-3"\>

\<name\>3 Hour Probability of Snow\</name\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\<value\>0\</value\>

\</probability-of-precipitation\>

\<weather time-layout="k-p3h-n21-3"
categorical-table="visibility-categories"\>

\<weather-conditions\>

\<value weather-type="rain" /\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<visibility\>7\</visibility\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value xsd:nil="true" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>6\</visibility\>

\</value\>

\<value weather-type="haze" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain" /\>

\<value weather-type="fog"\>

\<visibility\>3\</visibility\>

\</value\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>2\</visibility\>

\</value\>

\<value weather-type="haze" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>6\</visibility\>

\</value\>

\<value weather-type="haze" /\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value\>none\</value\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value\>none\</value\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>7\</visibility\>

\</value\>

\<value\>none\</value\>

\</weather-conditions\>

\<weather-conditions\>

\<value weather-type="rain"\>

\</value\>

\<value weather-type="fog" /\>

\</weather-conditions\>

\<visibility\>1\</visibility\>

\<weather-conditions\>

\<value weather-type="rain"\>

\<visibility\>4\</visibility\>

\</value\>

\<value weather-type="haze" /\>

\</weather-conditions\>

\</weather\>

\<cloud-amount type="ceiling" units="none" time-layout="k-p3h-n21-3"
categorical-table="ceiling-categories"\>

\<name\>ceiling\</name\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>7\</value\>

\<value\>5\</value\>

\<value\>5\</value\>

\<value\>5\</value\>

\<value\>7\</value\>

\<value\>5\</value\>

\<value\>5\</value\>

\<value\>4\</value\>

\<value\>4\</value\>

\<value\>4\</value\>

\<value\>5\</value\>

\<value\>5\</value\>

\<value\>4\</value\>

\<value\>3\</value\>

\</cloud-amount\>

\</parameters\>

\</data\>

\</dwml\>

[]{#__RefHeading___Toc170121647 .anchor}**Appendix E: Type Definitions**

> **dwmlType** (scope = global, element only)
>
> attribute = version, type = string, default = "1.0"
>
> choice
>
> sequence
>
> element = head, type = headType, min = 1, max = 1
>
> element = data, type = dataType, min = 1, max = 1
>
> sequence
>
> element=latLonList, type= latLonListType, min = 1, max = 1
>
> **headType** (scope = global, element only)
>
> sequence
>
> element = product, type productType, min = 1, max = 1
>
> element = source, type sourceType, min = 0, max = 1
>
> **productType** (scope = global, element only)
>
> attribute = concise-name, type = concise-nameType, use = required
>
> attribute = srsName, type = srsNameType, use = required
>
> attribute = operational-mode, type = operational-modeType, use =
> required
>
> anyOrder
>
> element = title, type = string, min = 0, max = 1
>
> element = field, type = fieldType, , min = 0, max = 1
>
> element = category, type = categoryType, min = 0, max = 1
>
> element = creation-date, type = creation-dateType, , min = 1, max = 1
>
> **fieldType** (scope = local, base = string)
>
> enumeration
>
> "meteorological"
>
> **categoryType** (scope = local, base = string)
>
> enumeration
>
> "forecastl"
>
> **concise-nameType** (scope = local, base = string)
>
> enumeration
>
> "time-series" "glance" "tabular-digital" "digital-zone" "dwmlByDay"
>
> **operational-modeType** (scope = local, base = string)
>
> enumeration
>
> "test" "developmental" "experimental" "official"
>
> **srsNameType** (scope = local, base = string)
>
> enumeration
>
> "WGS 1984"
>
> **creation-dateType** (scope = local, text only with base = dateTime)
>
> attribute = refresh-frequency, type = duration, use = required
>
> **sourceType** (scope = local, element only)
>
> anyOrder
>
> element = more-information, type = anyURI, min = 1, max = 1
>
> element = production-center, type = production-centerType, min = 0,
> max = 1
>
> element = disclaimer, type = anyURI, min = 0, max = 1
>
> element = credit, type = anyURI, min = 0, max = 1
>
> element = credit-logo, type = anyURI, min = 0, max = 1
>
> element = feedback, type = anyURI, min = 0, max = 1
>
> **production-centerType** (scope = local, mixed text and element)
>
> element = sub-center, type = string, min = 0, max = 1
>
> **dataType** (scope = local, element only)
>
> sequence
>
> element = location, type = locationType, min = 1, max = unbounded
>
> element = time-layout, type = time-layoutType, min = 1, max =
> unbounded
>
> element = parameters, type = parametersType, min = 1, max = unbounded
>
> **locationType** (scope = local, element only)
>
> element = location-key, type = string, min = 1, max = unbounded
>
> choice
>
> element = point, type = pointType, min = 0, max = 1
>
> element = city, type = cityType, min = 0, max = 1
>
> element = nws-zone, type = nws-zoneType, min = 0, max = 1
>
> element = area, type = areaType, min = 0, max = 1
>
> choice
>
> element = height, type = heightType, min = 0, max = 1
>
> element = level, type = levelType, min = 0, max = 1
>
> element = layer, type = layerType, min = 0, max = 1
>
> **location-keyType** (scope = local to data element, text only with
> base = string)
>
> must be unique
>
> **pointType** (scope = location element, element only)
>
> attribute = summarization, type = summarizationType, use = optional
>
> attribute = latitude, type = decimal, use = required
>
> attribute = longitude, type = decimal, use = required
>
> **cityType** (scope = local, text only with base = string)
>
> attribute = state, type = stateType, use = required
>
> attribute = summarization, type = summarizationType, use = optional
>
> **stateType** (scope = location element, base = string)
>
> pattern
>
> \[A-Z\]\[A-Z\] (only two digits allowed)
>
> **nws-zoneType** (scope = local, text only with base = string)
>
> attribute = state, type = stateType, use = required
>
> attribute = summarization, type = summarizationType, use = optional
>
> **summariztionType** (scope = data element, base = string)
>
> enumeration
>
> "mean" "medium" "mode" "maximum" "minimum" "12hourly" "24hourly"
> "none"
>
> **areaType** (scope = local, element only)
>
> attribute = area-type, type = area-typeType, use = required
>
> choice
>
> element = circle, type = circleType, min = 0, max = 1
>
> element = rectangle, type = rectangleType, min = 0, max = 1
>
> **area-typeType** (scope = local, base = string)
>
> enumeration
>
> "circle" "rectangle"
>
> **circleType** (scope = local, element only)
>
> attribute = summarization, type = summarizationType, use = optional
>
> element = point, type = pointType, min = 1, max = 1
>
> element = radius, type = radiusType, min = 1, max = 1
>
> **radiusType** (scope = local, base = decimal)
>
> attribute = radius-units, type=radius-unitsType, use = required
>
> **radius-unitsType** (scope = local, base = string)
>
> enumeration
>
> "statute miles" "kilometers"
>
> **rectangleType** (scope = local, element only)
>
> attribute = summarization, type = summarizationType, use = optional
>
> element = point, type = pointType, min = 4, max = 4
>
> **heightType** (scope = local, base = decimal)
>
> attribute = datum, type = datumType, use = required
>
> attribute = height-units, type = height-unitsType, use = required
>
> **datumType** (scope = local, base = string)
>
> enumeration
>
> "surface" "mean sea level"
>
> **height-unitsType** (scope = local, base = string)
>
> enumeration
>
> "feet" "meters"
>
> **levelType** (scope = local, base = nonNegativeInteger)
>
> attribute = vertical-coordinate, type = string, use = optional
>
> **layerType** (scope = local, base = nonNegativeInteger)
>
> attribute = vertical-coordinate, type = vertical-coordinateType, use =
> optional
>
> **time-layoutType** (scope = local, element only)
>
> attribute = time-coordinate, type = time-coordinateType, use =
> required
>
> attribute = summarization; type = summarizationType, use = optional
>
> sequence
>
> element = layout-key, type = layout-keyType, min = 1, max = unbounded
>
> sequence
>
> element = start-valid-time, type = start-valid-timeType, min = 1, max
> = unbounded
>
> element = end-valid-time, type = dateTime, min = 0, max = unbounded
>
> **time-coordinateType** (scope = local, base = string)
>
> enumeration
>
> "local time" "UTC"
>
> **layout-keyType** (scope = local, base = string)
>
> pattern
>
> k-p\\d+\[h\|d\|m\|y\]-n\\d+-\\d+ (something like k-p12h-n10-1)
>
> must be unique
>
> **start-valid-timeType** (scope = local, base = dateTime)
>
> attribute = period-name, type = string, use = optional
>
> **parametersType** (scope = local, element only)
>
> attribute = applicable-location, type = string, use = required
>
> anyOrder
>
> element = temperature, type = temperatureType, min = 0, max =
> unbounded
>
> element = precipitation, type = precipitationType, min = 0, max =
> unbounded
>
> element = probability-of-precipitation, type =
> probability-of-precipitationType,
>
> min = 0, max = unbounded
>
> element = convective-hazard, type = convective-hazardType,
>
> min = 0, max = unbounded
>
> element = wind-speed, type = wind-speedType, min = 0, max = unbounded
>
> element = direction, type = directionType, min = 0, max = unbounded
>
> element = cloud-amount, type = cloud-amountType, min = 0, max =
> unbounded
>
> element = weather, type = weatherType, min = 0, max = unbounded
>
> element = humidity, type = humidityType, min = 0, max = unbounded
>
> element = conditions-icon, type = conditions-iconType, min = 0, max =
> unbounded
>
> element = water-state, type = conditions-iconType, min = 0, max =
> unbounded
>
> **temperatureType** (scope = local, element only)
>
> attribute = type, type = typeType, use = required
>
> attribute = units, type = string, fixed = "F"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> choice
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> element = valueWithUncertainty, type = valueWithUncertaintyType, min =
> 1, max =
>
> unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "maximum" "minimum" "hourly" "dew point" "heat index" "wind chill"
> "apparent"
>
> "monthly anomalies" "seasonal anomalies" "8-14 day anomalies" "monthly
> anomolies"
>
> "seasonal anomolies" "rtma-hourly" "rtma-dew point"
>
> **valueWithUncertaintyType** (scope = local, element only)
>
> sequence
>
> element = value, type = valueType, min = 0, max = 1, nillable
>
> element = error, type = errorType, min = 0, max = 1, nillable
>
> **errorType** (scope = local, base = decimal)
>
> attribute = qualifier, type = qualifierType, use = optional
>
> **qaulifierType** (scope = local, base = string)
>
> enumeration
>
> "+/-", "+". "-", "%"
>
> **valueTypeType** (scope = local, base = string)
>
> enumeration
>
> "RTMA" "NDFD"
>
> **time-layoutType** (scope = element parameters, base = string)
>
> pattern
>
> k-p\\d+\[h\|d\|m\|y\]-n\\d+-\\d+ (something like k-p12h-n10-1)
>
> must match one layout-key element content
>
> **valueType** (scope = local, base = integer)
>
> attribute = type, type = valueTypeType, use = optional
>
> attribute = upper-range, type = upper-rangeType, use = optional
>
> attribute = lower-range, type = lower-rangeType, use = optional
>
> minInclusive = -459
>
> **upper-rangeType** (scope = local, base = integer)
>
> minInclusive = -459
>
> **lower-rangeType** (scope = local, base = integer)
>
> minInclusive = -459
>
> **precipitationType** (scope = local, element only)
>
> attribute = type, type = typeType, use = required
>
> attribute = units, type = string, fixed = "inches"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "liquid" "snow" "8-14 day anomalies" "monthly anomalies" "seasonal
> anomalies"
>
> "rtma-liquid"
>
> **valueType** (scope = local, base = nonNegativeInteger)
>
> attribute = upper-range, type = nonNegativeInteger, use = optional
>
> attribute = lower-range, type = nonNegativeInteger, use = optional
>
> **probability-of-precipitationType** (scope = local, element only)
>
> attribute = type, type = typeType, default = "12 hour"
>
> attribute = units, type = string, fixed = "percent"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "12 hour" "floating"
>
> **convective=hazardType** (scope = local, element only)
>
> attribute = type, type = typeType
>
> attribute = units, type = string, fixed = "percent"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "outlook" "tornadoes" "hail" "damaging thunderstorm winds" "extreme
> tornadoes" "extreme hail" "extreme thunderstorm winds" "severe
> thunderstorms" "extreme severe thunderstorms"
>
> **valueType** (scope = local, base = nonNegativeInteger)
>
> attribute = upper-range, type = upper-rangeType, use = optional
>
> attribute = lower-range, type = lower-rangeType, use = optional
>
> maxInclusive = 100
>
> **upper-rangeType** (scope = local, base = nonNegativeInteger)
>
> maxInclusive = 100
>
> **lower-rangeType** (scope = local, base = nonNegativeInteger)
>
> maxInclusive = 100
>
> **wind-speedType** (scope = local, element only)
>
> attribute = type, type = typeType, use = required
>
> attribute = units, type = unitsType, default = "knots"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> choice
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> element = valueWithUncertainty, type = valueWithUncertainty Type, min
> = 1, max =
>
> unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "sustained" "gust" "transport" "cumulative34" "cumulative50"
> "cumulative64" "incremental34" "incremental50" "incremental64"
> "rtma-sustained"
>
> **unitsType** (scope = local, base = string)
>
> enumeration
>
> "knots" "percent"
>
> **valueType** (scope = local, base = nonNegativeInteger)
>
> attribute = type, type = valueTypeType, use = optional
>
> attribute = upper-range, type = nonNegativeInteger, use = optional
>
> **valueWithUncertaintyType** (scope = local, element only)
>
> sequence
>
> element = value, type = valueType, min = 0, max = 1, nillable
>
> element = error, type = errorType, min = 0, max = 1, nillable
>
> **errorType** (scope = local, base = decimal)
>
> attribute = qualifier, type = qualifierType, use = optional
>
> **qaulifierType** (scope = local, base = string)
>
> enumeration
>
> "+/-", "+". "-", "%"
>
> **valueTypeType** (scope = local, base = string)
>
> enumeration
>
> "RTMA" "NDFD"
>
> **directionType** (scope = local to parameters element, element only)
>
> attribute = type, type = typeType, default = "wind"
>
> attribute = units, type = string, fixed = "degrees true"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> choice
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> element = valueWithUncertainty, type = valueWithUncertainty Type, min
> = 1, max =
>
> unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "wind" "swell"
>
> **valueWithUncertaintyType** (scope = local, element only)
>
> sequence
>
> element = value, type = valueType, min = 0, max = 1, nillable
>
> element = error, type = errorType, min = 0, max = 1, nillable
>
> **errorType** (scope = local, base = decimal)
>
> attribute = qualifier, type = qualifierType, use = optional
>
> **qaulifierType** (scope = local, base = string)
>
> enumeration
>
> "+/-", "+". "-", "%"
>
> **valueTypeType** (scope = local, base = string)
>
> enumeration
>
> "RTMA" "NDFD"
>
> **valueType** (scope = local, base = nonNegativeInteger)
>
> attribute = type, type = valueTypeType, use = optional
>
> maxInclusive = 360
>
> **cloud-amountType** (scope = local, element only)
>
> attribute = type, type = string, fixed = "total"
>
> attribute = units, type = string, fixed = "percent"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> sequence
>
> element = layer, type = layerType, min = 0, max = 0
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> NOTE: conversion-table values for sky cover can be found in Table 2.
>
> **valueType** (scope = local, base = nonNegativeInteger)
>
> attribute = upper-range, type = upper-rangeType, use = optional
>
> attribute = lower-range, type = lower-rangeType, use = optional
>
> maxInclusive = 100
>
> **upper-rangeType** (scope = local, base = nonNegativeInteger)
>
> maxInclusive = 100
>
> **lower-rangeType** (scope = local, base = nonNegativeInteger)
>
> maxInclusive = 100
>
> **weatherType** (scope = local, element only)
>
> attribute = time-layout, type = time-layoutType, use = required
>
> element = weather-conditions, type = weather-conditionsType, min = 1,
> max = unbounded, nillable
>
> **weather-conditionsType** (scope = local, element only)
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> attribute = weather-summary, type = string, use = optional
>
> **valueType** (scope = local, elements only)
>
> attribute = coverage, type = coverageType, use = optional
>
> attribute = intensity, type = intensityType, use = optional
>
> attribute = additive, type = additiveType, use = optional
>
> attribute = weather-type, type = weather-typeType, use = optional
>
> attribute = qualifier, type = qualifierType, use = optional
>
> element = visibility, type = visibilityType, min = 0, max = 1,
> nillable
>
> **coverageType** (scope = local, base = string)
>
> enumeration
>
> See Table 3 for valid values
>
> **intensityType** (scope = local, base = string)
>
> enumeration
>
> See Table 4 for valid values
>
> **additiveType** (scope = local, base = string)
>
> enumeration
>
> "and" "or"
>
> **visibilityType** (scope = local, base = string)
>
> attribute = visibility-units, type = visibility-unitsType, default =
> "statute miles"
>
> enumeration
>
> See Table 7 for valid values
>
> **visibility-unitsType** (scope = local, base = string)
>
> Enumeration
>
> "statute miles" "nautical miles"
>
> **qualifierType** (scope = local, base = string)
>
> pattern (comma delimited string)
>
> See Table 6, for valid values
>
> **weather-typeType** (scope = local, base = string)
>
> enumeration
>
> See Table 5, for valid values
>
> **humidityType** (scope = local, element only)
>
> attribute = type, type = typeType, default = "relative"
>
> attribute = units, type = string, fixed = "percent"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = valueType, min = 1, max = unbounded, nillable
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "relative" "max relative" "min relative"
>
> **valueType** (scope = local, base = nonNegativeInteger)
>
> attribute = upper-range, type = upper-rangeType, use = optional
>
> attribute = lower-range, type = lower-rangeType, use = optional
>
> maxInclusive = 100
>
> **upper-rangeType** (scope = local, base = nonNegativeInteger)
>
> maxInclusive = 100
>
> **lower-rangeType** (scope = local, base = nonNegativeInteger)
>
> maxInclusive = 100
>
> **conditions-iconType** (scope = local, element only)
>
> attribute = type, type = typeType, default = "forecast-NWS"
>
> attribute = time-layout, type = time-layoutType, use = required
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = icon-link, type = anyURI, min = 1, max = unbounded
>
> NOTE: The priority algorithm for icon determination can be found in
> Table 8 - Table 11. In these tables, the nomenclature
> \[20,30...90,100\] indicates that one of the 2 digit values appear in
> the icon file name. For example, the rain icon could be ra20.jpg,
> ra30.jpg on up to ra100.jpg.
>
> **typeType** (scope = local, base = string)
>
> enumeration
>
> "forecast-NWS"
>
> **categorical-definitions** (scope = local to parameter element,
> element only)
>
> element = categorical-table, type = categorical-tableType, min = 1,
> max = unbounded
>
> **categorical-table-elementType** (scope = local, element only)
>
> attribute = units, type = string, use = required
>
> element = categorical-key, type = key, min = 1, max = 1
>
> element = value, type = valueType, min = 1, max = unbounded
>
> **valueType** (scope = local, text only)
>
> attribute = category, type = string, use = required
>
> **conversion-definitions** (scope = local to parameter element,
> element only)
>
> element = categorical-table, type = categorical-tableType, min = 1,
> max = unbounded
>
> **conversion-table-elementType** (scope = local, element only)
>
> attribute = units, type = string, use = required
>
> sequence
>
> element = conversion-key, type = key, min = 1, max = 1
>
> sequence
>
> element = start-value, type = anyType, min = 1, max = unbounded
>
> element = start-value, type = anyType, min = 1, max = unbounded
>
> element = equivalence-value, type = string, min = 1, max = unbounded
>
> **water-state** (scope = local, element only)
>
> attribute = time-layout, type = time-layoutType, use = required
>
> choice
>
> sequence
>
> element = waves, type = wavesType, min = 0, max = unbounded
>
> element = swell, type = swellType, min = 0, max = unbounded
>
> element = seas, type = seasType, min = 0, max = unbounded
>
> element = ice-coverage, type = ice-coverageType, min = 0, max =
> unbounded
>
> **waveType** ( scope = local, element only)
>
> attribute = type, type = string, default = "wind"
>
> attribute = units, type = string, fixed = "feet"
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> attribute = period, type = nonNegativeInteger, use = optional
>
> attribute = steepness, type = nonNegativeInteger, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = nonNegativeInteger, min = 1, max = unbounded,
> nillable
>
> **swellType** (scope = local, element only)
>
> attribute = type, type = string, default = "none"
>
> attribute = units, type = string, fixed = "feet"
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> attribute = period, type = nonNegativeInteger, use = optional
>
> attribute = steepness, type = nonNegativeInteger, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> sequence
>
> element = value, type = nonNegativeInteger, min = 1, max = unbounded,
> nillable
>
> element = direction, type = directionType, min = 0, max = unbounded,
> nillable
>
> **seasType** (scope = local, element only)
>
> attribute = type, type = string, default = "combined"
>
> attribute = units, type = string, fixed = "feet"
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = nonNegativeInteger, min = 1, max = unbounded,
> nillable
>
> **ice-coverageType** (scope = local, element only)
>
> attribute = type, type = string, default = "total"
>
> attribute = units, type = string, fixed = "percent"
>
> attribute = categorical-table, type = string, use = optional
>
> attribute = conversion-table, type = string, use = optional
>
> sequence
>
> element = name, type = string, min = 0, max = 1
>
> element = value, type = nonNegativeInteger, min = 1, max = unbounded,
> nillable
>
> **latLonListType** (scope = local, base = string)
>
> pattern (space delimited string of latitude and longitude pairs)

+-----------------------------------+-----------------------------------+
| **Total Sky Cover Values**        | **Text Equivalent**               |
|                                   |                                   |
| **(\<value\>)**                   | **(*equivalent-value*)**          |
+-----------------------------------+-----------------------------------+
| Sky Cover ≤ 6percent              | clear                             |
+-----------------------------------+-----------------------------------+
| 6percent \< Sky Cover ≤ 31percent | mostly clear                      |
+-----------------------------------+-----------------------------------+
| 31percent \< Sky Cover ≤          | partly cloudy                     |
| 69percent                         |                                   |
+-----------------------------------+-----------------------------------+
| 69percent \< Sky Cover ≤          | mostly cloudy                     |
| 94percent                         |                                   |
+-----------------------------------+-----------------------------------+
| 94percent \< Sky Cover ≤          | cloudy                            |
| 100percent                        |                                   |
+-----------------------------------+-----------------------------------+

[]{#__RefHeading___Toc141760772 .anchor}Table 2: Sky Cover to Text
Conversion (Source: NWSI 10-503).

+-----------------+-----------------+-----------------+-----------------+
| **Coverage      |                 |                 |                 |
| Values**        |                 |                 |                 |
|                 |                 |                 |                 |
| (***weath       |                 |                 |                 |
| er-coverage***) |                 |                 |                 |
+-----------------+-----------------+-----------------+-----------------+
| slight chance   | occasional      | scattered       | areas           |
+-----------------+-----------------+-----------------+-----------------+
| chance          | definitely      | numerous        | widespread      |
+-----------------+-----------------+-----------------+-----------------+
| likely          | isolated        | patchy          | none            |
+-----------------+-----------------+-----------------+-----------------+

[]{#__RefHeading___Toc141760773 .anchor}Table 3: Valid Values for
Weather Coverage Attribute.

+-----------------------------------+-----------------------------------+
| **Intensity Values**              | **Intensity Values**              |
|                                   |                                   |
| (***weather-intensity***)         | (***weather-intensity***)         |
+-----------------------------------+-----------------------------------+
| very light                        | heavy                             |
+-----------------------------------+-----------------------------------+
| light                             | none                              |
+-----------------------------------+-----------------------------------+
| moderate                          |                                   |
+-----------------------------------+-----------------------------------+

[]{#__RefHeading___Toc141760774 .anchor}Table 4: Valid Values for
Weather Intensity.

+-----------------------------------+-----------------------------------+
| **Weather Values**                | **Weather Values**                |
|                                   |                                   |
| **(\<value\>)**                   | **(\<value\>)**                   |
+===================================+===================================+
| freezing drizzle                  | thunderstorms                     |
+-----------------------------------+-----------------------------------+
| freezing rain                     | drizzle                           |
+-----------------------------------+-----------------------------------+
| snow shower                       | fog                               |
+-----------------------------------+-----------------------------------+
| blowing snow                      | haze                              |
+-----------------------------------+-----------------------------------+
| blowing dust                      | blowing sand                      |
+-----------------------------------+-----------------------------------+
| rain shower                       | ice crystals                      |
+-----------------------------------+-----------------------------------+
| ice pellets                       | volcanic ash                      |
+-----------------------------------+-----------------------------------+
| frost                             | water spouts                      |
+-----------------------------------+-----------------------------------+
| rain                              | freezing fog                      |
+-----------------------------------+-----------------------------------+
| hail                              | ice fog                           |
+-----------------------------------+-----------------------------------+
| snow                              | freezing spray                    |
+-----------------------------------+-----------------------------------+
| smoke                             | none                              |
+-----------------------------------+-----------------------------------+

[]{#__RefHeading___Toc141760775 .anchor}Table 5: Valid Weather Values.

+-----------------------------------+-----------------------------------+
| **Weather Attributes**            | **Weather Attributes**            |
|                                   |                                   |
| ***(weather-qualifier)***         | **(*weather-qualifier*)**         |
+===================================+===================================+
| frequent lightning                | gusty winds                       |
+-----------------------------------+-----------------------------------+
| heavy rain                        | damaging winds                    |
+-----------------------------------+-----------------------------------+
| small hail                        | large hail                        |
+-----------------------------------+-----------------------------------+
| outlying areas                    | on bridges and overpasses         |
+-----------------------------------+-----------------------------------+
| on grassy areas                   | or                                |
+-----------------------------------+-----------------------------------+
| dry                               | highest ranking                   |
+-----------------------------------+-----------------------------------+
| include unconditionally           | tornado                           |
+-----------------------------------+-----------------------------------+
| mixture                           | none                              |
+-----------------------------------+-----------------------------------+

[]{#__RefHeading___Toc141760776 .anchor}Table 6: Valid Weather
Attributes.

+------------------------+----------------------+----------------------+
| **Visibility Values**  |                      |                      |
|                        |                      |                      |
| **(\<visibility\>)**   |                      |                      |
+------------------------+----------------------+----------------------+
| 0                      | 1 ½                  | 5                    |
+------------------------+----------------------+----------------------+
| ¼                      | 2                    | 6                    |
+------------------------+----------------------+----------------------+
| ½                      | 2 ½                  | 6+                   |
+------------------------+----------------------+----------------------+
| ¾                      | 3                    | none                 |
+------------------------+----------------------+----------------------+
| 1                      | 4                    |                      |
+------------------------+----------------------+----------------------+

[]{#__RefHeading___Toc141760777 .anchor}Table 7: Valid Visibility
Values.

+---------------------------------+------------------------------------+
| **Weather Condition**           | **Index of icons found at:**       |
|                                 |                                    |
|                                 | **http://www.wea                   |
|                                 | ther.gov/weather/images/fcicons/** |
+=================================+====================================+
| IC                              | no icon                            |
+---------------------------------+------------------------------------+
| VA                              | no icon                            |
+---------------------------------+------------------------------------+
| WP                              | no icon                            |
+---------------------------------+------------------------------------+
| ZY                              | no icon                            |
+---------------------------------+------------------------------------+
| FR                              | no icon                            |
+---------------------------------+------------------------------------+
| T AND (sky \> 60)               | ntsra\[20,30...90,100\].jpg        |
+---------------------------------+------------------------------------+
| T AND (sky \<= 60)              | nscttsra\[20,30...90,100\].jpg     |
+---------------------------------+------------------------------------+
| (S OR SW) AND IP                | ip\[20,30...90,100\].jpg           |
+---------------------------------+------------------------------------+
| (R OR RW OR L) AND IP           | nraip\[20,30...90,100\].jpg        |
+---------------------------------+------------------------------------+
| (ZR OR ZL) AND (S OR SW OR IP)  | mix\[20,30...90,100\].jpg          |
+---------------------------------+------------------------------------+
| (R OR RW OR L) AND (S OR SW)    | nrasn\[20,30...90,100\].jpg        |
+---------------------------------+------------------------------------+
| S OR SW                         | nsn\[20,30...90,100\].jpg          |
+---------------------------------+------------------------------------+
| ZR OR ZL                        | fzra\[20,30...90,100\].jpg         |
+---------------------------------+------------------------------------+
| IP                              | ip\[20,30...90,100\].jpg           |
+---------------------------------+------------------------------------+
| RW AND (sky \> 60)              | nra\[20,30...90,100\].jpg          |
+---------------------------------+------------------------------------+
| RW AND (sky \<= 60)             | hi_nshwrs\[20,30...90,100\].jpg    |
+---------------------------------+------------------------------------+
| L OR R                          | nra\[20,30...90,100\].jpg          |
+---------------------------------+------------------------------------+
| BS                              | blizzard.jpg                       |
+---------------------------------+------------------------------------+
| BD OR BN                        | du.jpg                             |
+---------------------------------+------------------------------------+
| H                               | no icon                            |
+---------------------------------+------------------------------------+
| K                               | fu.jpg                             |
+---------------------------------+------------------------------------+
| F OR ZF OR IF                   | nfg.jpg                            |
+---------------------------------+------------------------------------+
| (wind \> 25)                    | nwind.jpg                          |
+---------------------------------+------------------------------------+
| (sky \> 94)                     | novc.jpg                           |
+---------------------------------+------------------------------------+
| (sky \> 69)                     | nbkn.jpg                           |
+---------------------------------+------------------------------------+
| (sky \> 31)                     | nsct.jpg                           |
+---------------------------------+------------------------------------+
| (sky \> 6)                      | nfew.jpg                           |
+---------------------------------+------------------------------------+
| default                         | nskc.jpg                           |
+---------------------------------+------------------------------------+

[]{#__RefHeading___Toc141760778 .anchor}Table 8: NDFDgen Night Time Icon
Algorithm (priority in ascending order).

+---------------------------------+------------------------------------+
| **Weather Condition**           | **Index of icons found at:**       |
|                                 |                                    |
|                                 | **http://www.wea                   |
|                                 | ther.gov/weather/images/fcicons/** |
+=================================+====================================+
| IC                              | no icon                            |
+---------------------------------+------------------------------------+
| VA                              | no icon                            |
+---------------------------------+------------------------------------+
| WP                              | no icon                            |
+---------------------------------+------------------------------------+
| ZY                              | no icon                            |
+---------------------------------+------------------------------------+
| FR                              | no icon                            |
+---------------------------------+------------------------------------+
| T AND (sky \> 60)               | tsra\[20,30...90,100\].jpg         |
+---------------------------------+------------------------------------+
| T AND (sky \<= 60)              | scttsra\[20,30...90,100\].jpg      |
+---------------------------------+------------------------------------+
| (S OR SW) AND IP                | ip\[20,30...90,100\].jpg           |
+---------------------------------+------------------------------------+
| (R OR RW OR L) AND IP           | raip\[20,30...90,100\].jpg         |
+---------------------------------+------------------------------------+
| (ZR OR ZL) AND (S OR SW OR IP)  | mix\[20,30...90,100\].jpg          |
+---------------------------------+------------------------------------+
| (R OR RW OR L) AND (S OR SW)    | rasn\[20,30...90,100\].jpg         |
+---------------------------------+------------------------------------+
| (S OR SW)                       | sn\[20,30...90,100\].jpg           |
+---------------------------------+------------------------------------+
| (ZR OR ZL)                      | fzra.jpg                           |
+---------------------------------+------------------------------------+
| IP                              | ip\[20,30...90,100\].jpg           |
+---------------------------------+------------------------------------+
| RW AND (sky \> 60)              | shra\[20,30...90,100\].jpg         |
+---------------------------------+------------------------------------+
| RW AND (sky \<= 60)             | hi_shwrs\[20,30...90,100\].jpg     |
+---------------------------------+------------------------------------+
| L OR R                          | ra\[20,30...90,100\].jpg           |
+---------------------------------+------------------------------------+
| BS                              | blizzard.jpg                       |
+---------------------------------+------------------------------------+
| BD OR BN                        | du.jpg                             |
+---------------------------------+------------------------------------+
| H                               | no icon                            |
+---------------------------------+------------------------------------+
| K                               | fu.jpg                             |
+---------------------------------+------------------------------------+
| F OR ZF OR IF                   | fg.jpg                             |
+---------------------------------+------------------------------------+
| (temp \< -40)                   | cold.jpg                           |
+---------------------------------+------------------------------------+
| (temp \> 110)                   | hot.jpg                            |
+---------------------------------+------------------------------------+
| (wind \> 25)                    | wind.jpg                           |
+---------------------------------+------------------------------------+
| (sky \> 94)                     | ovc.jpg                            |
+---------------------------------+------------------------------------+
| (sky \> 69)                     | bkn.jpg                            |
+---------------------------------+------------------------------------+
| (sky \> 31)                     | sct.jpg                            |
+---------------------------------+------------------------------------+
| (sky \> 6)                      | few.jpg                            |
+---------------------------------+------------------------------------+
| default                         | skc.jpg                            |
+---------------------------------+------------------------------------+

[]{#__RefHeading___Toc141760779 .anchor}Table 9: NDFDgen Day Time Icon
Algorithm (priority in ascending order).

+------------------------------------+---------------------------------+
| **Weather Condition**              | **Index of icons found at:**    |
|                                    |                                 |
|                                    | **http://www.weathe             |
|                                    | r.gov/weather/images/fcicons/** |
+====================================+=================================+
| IC                                 | no icon                         |
+------------------------------------+---------------------------------+
| VA                                 | no icon                         |
+------------------------------------+---------------------------------+
| WP                                 | no icon                         |
+------------------------------------+---------------------------------+
| ZY                                 | no icon                         |
+------------------------------------+---------------------------------+
| FR                                 | no icon                         |
+------------------------------------+---------------------------------+
| T AND (PoP \>= 10) AND (sky \> 60) | ntsra\[20,30...90,100\].jpg     |
+------------------------------------+---------------------------------+
| T AND (PoP \>= 10) AND (sky \<=    | nscttsra\[20,30...90,100\].jpg  |
| 60)                                |                                 |
+------------------------------------+---------------------------------+
| IP AND (S OR SW) AND (PoP \>= 20)  | ip\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| IP AND (R OR RW) AND (PoP \>= 20)  | nraip\[20,30...90,100\].jpg     |
+------------------------------------+---------------------------------+
| IP AND (ZL OR ZR) AND (PoP \>= 20) | mix\[20,30...90,100\].jpg       |
+------------------------------------+---------------------------------+
| (R OR RW) AND (ZL OR ZR) AND (PoP  | fzra\[20,30...90,100\].jpg      |
| \>= 20)                            |                                 |
+------------------------------------+---------------------------------+
| (ZR OR ZL) AND (S OR SW) AND (PoP  | mix\[20,30...90,100\].jpg       |
| \>= 20)                            |                                 |
+------------------------------------+---------------------------------+
| ZL AND (PoP \>= 20)                | fzra\[20,30...90,100\].jpg      |
+------------------------------------+---------------------------------+
| ZR AND (PoP \>= 20)                | fzra\[20,30...90,100\].jpg      |
+------------------------------------+---------------------------------+
| (R OR RW) AND (S OR SW) AND (PoP   | nrasn\[20,30...90,100\].jpg     |
| \>= 20)                            |                                 |
+------------------------------------+---------------------------------+
| S AND (PoP \>= 20)                 | nsn\[20,30...90,100\].jpg       |
+------------------------------------+---------------------------------+
| (S OR SW) AND (PoP \>= 20) AND     | nsn\[20,30...90,100\].jpg       |
| (Int = \'\--\')                    |                                 |
+------------------------------------+---------------------------------+
| SW AND (PoP \>= 20) AND (Int !=    | nsn\[20,30...90,100\].jpg       |
| \'\--\') AND (sky \<= 60)          |                                 |
+------------------------------------+---------------------------------+
| SW AND (PoP \>= 20) AND (Int !=    | nsn\[20,30...90,100\].jpg       |
| \'\--\') AND (sky \> 60)           |                                 |
+------------------------------------+---------------------------------+
| L AND (PoP \>= 20)                 | nra\[20,30...90,100\].jpg       |
+------------------------------------+---------------------------------+
| R AND (PoP \>= 20)                 | nra\[20,30...90,100\].jpg       |
+------------------------------------+---------------------------------+
| RW AND (PoP \>= 20) AND (sky \<=   | nra\[20,30...90,100\].jpg       |
| 60)                                |                                 |
+------------------------------------+---------------------------------+
| RW AND (PoP \>= 20) AND (sky \>    | hi_nshwrs\[20,30...90,100\].jpg |
| 60)                                |                                 |
+------------------------------------+---------------------------------+
| IP AND (PoP \>= 20)                | ip\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| K                                  | fu.jpg                          |
+------------------------------------+---------------------------------+
| ZF                                 | nfg.jpg                         |
+------------------------------------+---------------------------------+
| IF                                 | nfg.jpg                         |
+------------------------------------+---------------------------------+
| H                                  | no icon                         |
+------------------------------------+---------------------------------+
| BN                                 | du.jpg                          |
+------------------------------------+---------------------------------+
| BD                                 | du.jpg                          |
+------------------------------------+---------------------------------+
| BS                                 | blizzard.jpg                    |
+------------------------------------+---------------------------------+
| F                                  | nfg.jpg                         |
+------------------------------------+---------------------------------+
| (wind \>= 15)                      | nwind.jpg                       |
+------------------------------------+---------------------------------+
| (sky \<= 101)                      | novc.jpg                        |
+------------------------------------+---------------------------------+
| (sky \<= 90)                       | nbkn.jpg                        |
+------------------------------------+---------------------------------+
| (sky \<70)                         | nsct.jpg                        |
+------------------------------------+---------------------------------+
| (sky \<40                          | nfew.jpg                        |
+------------------------------------+---------------------------------+
| (sky \<= 15)                       | nskc.jpg                        |
+------------------------------------+---------------------------------+

[]{#__RefHeading___Toc141760780 .anchor}Table 10: NDFDgenByDay Night
Time Icon Algorithm (format = '12 hourly') (priority in ascending
order).

+------------------------------------+---------------------------------+
| **Weather Condition**              | **Index of icons found at:**    |
|                                    |                                 |
|                                    | **http://www.weathe             |
|                                    | r.gov/weather/images/fcicons/** |
+====================================+=================================+
| IC                                 | no icon                         |
+------------------------------------+---------------------------------+
| VA                                 | no icon                         |
+------------------------------------+---------------------------------+
| WP                                 | no icon                         |
+------------------------------------+---------------------------------+
| ZY                                 | no icon                         |
+------------------------------------+---------------------------------+
| FR                                 | no icon                         |
+------------------------------------+---------------------------------+
| T AND (PoP \>= 10) AND (sky \> 60) | tsra\[20,30...90,100\].jpg      |
+------------------------------------+---------------------------------+
| T AND (PoP \>= 10) AND (sky \<=    | scttsra\[20,30...90,100\].jpg   |
| 60)                                |                                 |
+------------------------------------+---------------------------------+
| IP AND (S OR SW) AND (PoP \>= 20)  | ip\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| IP AND (R OR RW) AND (PoP \>= 20)  | raip\[20,30...90,100\].jpg      |
+------------------------------------+---------------------------------+
| IP AND (ZL OR ZR) AND (PoP \>= 20) | mix\[20,30...90,100\].jpg       |
+------------------------------------+---------------------------------+
| (R OR RW) AND (ZL OR ZR) AND (PoP  | fzra\[20,30...90,100\].jpg      |
| \>= 20)                            |                                 |
+------------------------------------+---------------------------------+
| (ZR OR ZL) AND (S OR SW) AND (PoP  | mix\[20,30...90,100\].jpg       |
| \>= 20)                            |                                 |
+------------------------------------+---------------------------------+
| ZL AND (PoP \>= 20)                | fzra\[20,30...90,100\].jpg      |
+------------------------------------+---------------------------------+
| ZR AND (PoP \>= 20)                | fzra\[20,30...90,100\].jpg      |
+------------------------------------+---------------------------------+
| (R OR RW) AND (S OR SW) AND (PoP   | rasn\[20,30...90,100\].jpg      |
| \>= 20)                            |                                 |
+------------------------------------+---------------------------------+
| S AND (PoP \>= 20)                 | sn\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| (S OR SW) AND (PoP \>= 20) AND     | sn\[20,30...90,100\].jpg        |
| (Int = \'\--\')                    |                                 |
+------------------------------------+---------------------------------+
| SW AND (PoP \>= 20) AND (Int !=    | sn\[20,30...90,100\].jpg        |
| \'\--\') AND (sky \<= 60)          |                                 |
+------------------------------------+---------------------------------+
| SW AND (PoP \>= 20) AND (Int !=    | sn\[20,30...90,100\].jpg        |
| \'\--\') AND (sky \> 60)           |                                 |
+------------------------------------+---------------------------------+
| L AND (PoP \>= 20)                 | ra\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| R AND (PoP \>= 20)                 | ra\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| RW AND (PoP \>= 20) AND (sky \<=   | shra\[20,30...90,100\].jpg      |
| 60)                                |                                 |
+------------------------------------+---------------------------------+
| RW AND (PoP \>= 20) AND (sky \>    | hi_shwrs\[20,30...90,100\].jpg  |
| 60)                                |                                 |
+------------------------------------+---------------------------------+
| IP AND (PoP \>= 20)                | ip\[20,30...90,100\].jpg        |
+------------------------------------+---------------------------------+
| K                                  | fu.jpg                          |
+------------------------------------+---------------------------------+
| ZF                                 | fg.jpg                          |
+------------------------------------+---------------------------------+
| IF                                 | fg.jpg                          |
+------------------------------------+---------------------------------+
| H                                  | no icon                         |
+------------------------------------+---------------------------------+
| BN                                 | du.jpg                          |
+------------------------------------+---------------------------------+
| BD                                 | du.jpg                          |
+------------------------------------+---------------------------------+
| BS                                 | blizzard.jpg                    |
+------------------------------------+---------------------------------+
| F                                  | fg.jpg                          |
+------------------------------------+---------------------------------+
| (wind \>= 15)                      | wind.jpg                        |
+------------------------------------+---------------------------------+
| (MaxT \< 32)                       | cold.jpg                        |
+------------------------------------+---------------------------------+
| (MaxT \> 95)                       | hot.jpg                         |
+------------------------------------+---------------------------------+
| (sky \<= 101)                      | ovc.jpg                         |
+------------------------------------+---------------------------------+
| (sky \<= 90)                       | bkn.jpg                         |
+------------------------------------+---------------------------------+
| (sky \<70)                         | sct.jpg                         |
+------------------------------------+---------------------------------+
| (sky \<40                          | few.jpg                         |
+------------------------------------+---------------------------------+
| (sky \<= 15)                       | skc.jpg                         |
+------------------------------------+---------------------------------+

[]{#__RefHeading___Toc141760781 .anchor}Table 11: NDFDgenByDay Day Time
Icon Algorithm (format = '12 hourly' or '24 hourly) (priority in
ascending order).

  -----------------------------------------------------------------------
  **Weather Condition**              **Weather Summary Phrase**
  ---------------------------------- ------------------------------------
  IC                                 if \$coverage = \"patchy\" OR
                                     \"areas\" \--\> \"\$coverage Ice
                                     Crystals\" else \--\> \"Ice
                                     Crystals\"

  VA                                 Volcanic Ash

  WP                                 Water Spout

  ZY                                 Freezing Spray

  FR                                 if \$coverage = \"patchy\" OR
                                     \"areas\" \--\> \"\$coverage Frost\"
                                     else \--\> \"Frost\"

  T AND (PoP \>= 10) AND (sky \> 60) if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Thunderstorms\" else if \$coverage =
                                     \"likely\" \--\> \"Thunderstorms
                                     Likely\" else \--\>
                                     \"Thunderstorms\" OR if qualifier =
                                     \"Damaging Winds\" OR qualifier =
                                     \"Large Hail\" OR qualifier =
                                     \"Tornados\" \--\> \"Severe Tstms\"

  T AND (PoP \>= 10) AND (sky \<=    if \$coverage = \"chance\" OR
  60)                                \"slight chance\" \--\> \"Chance
                                     Thunderstorms\" else if \$coverage =
                                     \"likely\" \--\> \"Thunderstorms
                                     Likely\" else \--\>
                                     \"Thunderstorms\" OR if qualifier =
                                     \"Damaging Winds\" OR qualifier =
                                     \"Large Hail\" OR qualifier =
                                     \"Tornados\" \--\> \"Severe Tstms\"

  IP AND (S OR SW) AND (PoP \>= 20)  if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Snow/Sleet\" else if \$coverage =
                                     \"likely\" \--\> \"Snow/Sleet
                                     Likely\" else \--\> \"Snow/Sleet\"

  IP AND (R OR RW) AND (PoP \>= 20)  if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Rain/Sleet\" else if \$coverage =
                                     \"likely\" \--\> \"Rain/Sleet
                                     Likely\" else \--\> \"Rain/Sleet\"

  IP AND (ZL OR ZR) AND (PoP \>= 20) Wintry Mix

  (R OR RW) AND (ZL OR ZR) AND (PoP  if \$coverage = \"chance\" OR
  \>= 20)                            \"slight chance\" \--\> \"Chance
                                     Rain/Freezing Rain\" else if
                                     \$coverage = \"likely\" \--\>
                                     \"Rain/Freezing Rain Likely\" else
                                     \--\> \"Rain/Freezing Rain\"

  (ZR OR ZL) AND (S OR SW) AND (PoP  Wintry Mix
  \>= 20)                            

  ZL AND (PoP \>= 20)                if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Freezing Drizzle\" else if
                                     \$coverage = \"likely\" \--\>
                                     \"Freezing Drizzle Likely\" else
                                     \--\> \"Freezing Drizzle\"

  ZR AND (PoP \>= 20)                if coverage = \"chance\" OR \"slight
                                     chance\" \--\> \"Chance Freezing
                                     Rain\" else if coverage = \"likely\"
                                     \--\> \"Freezing Rain Likely\" else
                                     \--\> \"Freezing Rain\"

  (R OR RW) AND (S OR SW) AND (PoP   if coverage = \"chance\" OR \"slight
  \>= 20)                            chance\" \--\> \"Chance Rain/Snow\"
                                     else if coverage = \"likely\" \--\>
                                     \"Rain/Snow Likely\" else \--\>
                                     \"Rain/Snow\"

  S AND (PoP \>= 20)                 if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Snow\" else if \$coverage =
                                     \"likely\" \--\> \"Snow Likely\"
                                     else \--\> \"Snow\" OR if qualifier
                                     = \"heavy\" \--\> \"Heavy Snow\"

  (S OR SW) AND (PoP \>= 20) AND     if \$coverage = \"chance\" OR
  (Int = \'\--\')                    \"slight chance\" \--\> \"Chance
                                     Flurries\" else if \$coverage =
                                     \"likely\" \--\> \"Flurries Likely\"
                                     else \--\> \"Flurries\"

  SW AND (PoP \>= 20) AND (Int !=    if \$coverage = \"chance\" OR
  \'\--\') AND (sky \<= 60)          \"slight chance\" \--\> \"Chance
                                     Snow Showers\" else if \$coverage =
                                     \"likely\" \--\> \"Snow Showers
                                     Likely\" else \--\> \"Snow Showers\"

  SW AND (PoP \>= 20) AND (Int !=    if \$coverage = \"chance\" OR
  \'\--\') AND (sky \> 60)           \"slight chance\" \--\> \"Chance
                                     Snow Showers\" else if \$coverage =
                                     \"likely\" \--\> \"Snow Showers
                                     Likely\" else \--\> \"Snow Showers\"

  L AND (PoP \>= 20)                 if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Drizzle\" else if \$coverage =
                                     \"likely\" \--\> \"Drizzle Likely\"
                                     else \--\> \"Drizzle\"

  R AND (PoP \>= 20)                 if \$coverage = \"chance\" OR
                                     \"slight chance\" \--\> \"Chance
                                     Rain\" else if \$coverage =
                                     \"likely\" \--\> \"Rain Likely\"
                                     else \--\> \"Rain\" OR if qualifier
                                     = \"heavy\" \--\> \"Heavy Rain\"

  RW AND (PoP \>= 20) AND (sky \<=   if \$coverage = \"chance\" OR
  60)                                \"slight chance\" \--\> \"Chance
                                     Rain Showers\" else if \$coverage =
                                     \"likely\" \--\> \"Rain Showers
                                     Likely\" else \--\> \"Rain Showers\"

  RW AND (PoP \>= 20) AND (sky \>    if \$coverage = \"chance\" OR
  60)                                \"slight chance\" \--\> \"Chance
                                     Rain Showers\" else if \$coverage =
                                     \"likely\" \--\> \"Rain Showers
                                     Likely\" else \--\> \"Rain Showers\"

  IP AND (PoP \>= 20)                Sleet

  K                                  if \$coverage = \"patchy\" OR
                                     \"areas\" \--\> \"\$coverage Smoke\"
                                     else \--\> \"Smoke\"

  ZF                                 if \$coverage = \"patchy\" OR
                                     \"areas\" \--\> \"\$coverage
                                     Freezing Fog\" else \--\> \"Freezing
                                     Fog\"

  IF                                 if \$coverage = \"patchy\" OR
                                     \"areas\" \--\> \"\$coverage Ice
                                     Fog\" else \--\> \"Ice Fog\"

  H                                  if \$coverage = \"patchy\" OR
                                     \"areas\" \--\> \"\$coverage Haze\"
                                     else \--\> \"Haze\"

  BN                                 Blowing Sand

  BD                                 Blowing Dust

  BS                                 Blowing Snow

  F                                  if intensity = heavy \--\> \"Dense
                                     Fog\" else ( if \$coverage =
                                     \"patchy\" OR \"areas\" \--\>
                                     \"\$coverage Fog\" else \--\>
                                     \"Fog\")

  (wind \>= 15)                      if wind speed \> 25 mph \--\>
                                     \"Windy\" else if (wind speed \> 15
                                     AND wind direction is between NE and
                                     NW AND the date is between 1 October
                                     and 1 April AND the maximum
                                     temperature is less than 32 \--\>
                                     \"Blustery\") else if (wind speed \>
                                     15 \--\> \"Breezy\")

  (MaxT \< 32)                       Cold

  (MaxT \> 95)                       Hot

  (sky \<= 101)                      Cloudy

  (sky \<= 90)                       Mostly Cloudy

  (sky \<70)                         Partly Cloudy

  (sky \<40)                         Mostly Sunny

  (sky \<= 15)                       Sunny

  Cloud Category change \> 2         Increasing Clouds

  Cloud Category change \> 2 AND max Becoming Cloudy
  cloud is cloudy                    

  Cloud Category change \< 3         Clearing

  Cloud Category change \< 3 AND     Gradual Clearing
  time of change \> 12 hours         

  Cloud Category change \< 3 AND     Clearing Late
  time of change \> 12 hours AND     
  late in forecast period            

  Cloud Category change \< 3 AND     Decreasing Clouds
  time of change \< 12 hours         

  Cloud Category change \< 3 AND max Becoming Sunny
  cloud is clear                     
  -----------------------------------------------------------------------

[]{#__RefHeading___Toc141760782 .anchor}Table 12: NDFDgenByDay Weather
Summary Phrases (format = '12 hourly' or '24 hourly') (priority in
ascending order).

  -----------------------------------------------------------------------
  **Weather Condition**              **Weather Summary Phrase**
  ---------------------------------- ------------------------------------
  (sky \<= 15) AND is nighttime      Clear

  (sky \< 40) AND is nighttime       Mostly Clear
  -----------------------------------------------------------------------

[]{#__RefHeading___Toc141760783 .anchor}Table 13: NDFDgenByDay Weather
Summary Phrases (format = '12 hourly') (priority in ascending order).

[]{#__RefHeading___Toc170121648 .anchor}**Appendix F: References**

1.  The National Digital Forecast Database Development web site
    (<http://onestop.noaa3.awips.noaa.gov/ndfd/index.html>)

2.  National Weather Service Instruction 10-506 (DRAFT), Digital Data
    Products/Services Specification
    (<http://www.nws.noaa.gov/ost/ifps_sst/10-506.pdf>)

3.  National Weather Service Instruction 10-503, Public Weather Services
    (<http://www.nws.noaa.gov/directives/010/pd01005003a.pdf>)

4.  National Weather Service Instruction 10-310, Marine and Coastal
    Weather Service Program
    (<http://www.nws.noaa.gov/directives/010/pd01003010c.pdf> )

5.  FM 92-XII GRIB General Regularly-distributed Information in Binary
    Form (<http://www.nws.noaa.gov/tdl/iwt/grib2/frameset_grib2.htm>)

6.  Description of the AVN MAV MOS Alphanumeric Message
    (<http://www.nws.noaa.gov/mdl/synop/mavcard.htm> )

7.  Definitions of AVN MOS Weather Elements
    (<http://www.nws.noaa.gov/mdl/synop/avnacronym.htm> )