**National Climatic Data Center**

**DATA DOCUMENTATION**

**FOR**

**DATASET 9507 (DSI-9507)**

**Department of Energy Storm Occurrences**

**December 22, 2003**

National Climatic Data Center

151 Patton Ave.

Asheville, NC 28801-5001 USA

**Table of Contents**

[Topic Page Number]{.underline}

1\.
Abstract\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...
3

2\. Element Names and Definitions**:**
\...\...\...\...\...\...\...\...\.... 3

3\. Start
Date\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\... 27

4\. Stop
Date\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.... 27

5\.
Coverage\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....
27

6\. How to order
data\...\...\...\...\...\...\...\...\...\...\...\...\..... 27

7\. Archiving Data Center.
\...\...\...\...\...\...\...\...\...\...\..... 27

8\. Technical
Contact\...\...\...\...\...\...\...\...\...\...\...\...\..... 28

9\. Known Uncorrected Problems\...\...\...\...\...\...\...\...\...\.....
28

10\. Quality
Statement\...\...\...\...\...\...\...\...\...\...\...\...\.... 28

11\. Essential Companion Data Sets\...\...\...\...\...\...\...\...\....
28

12\.
References\...\...\...\...\...\...\...\...\...\...\...\...\...\...\.....
28

13\.
Appendix\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....
29

**1. [Abstract]{.underline}:** The National Climatic Data Center (NCDC)
has, in archive, a historical digital database that contains information
on synoptic storms and other climatological factors that affect
coastlines and may be used by a vector-based ARC/INFO geographic
information system (GIS), a raster GIS, or a non-GIS database. The data
were extracted, compiled, or derived from publications and records
obtained from the National Oceanic Atmospheric Administration (NOAA),
U.S. Navy, foreign government agencies, universities, and other
miscellaneous data sources.

The dataset consists of the following data groups: annual probabilities
of occurence of tropical storms and hurricanes for coastal areas of the
U.S., Canada, and Bermuda by 1 X 1 degree cells; annual probabilities of
occurence of tropical storms, hurricanes, super typhoons (winds 67
meters/second or greater), and mean forward velocities of tropical
cyclones (without regard to tropical cyclone intensity) for the world by
5 X 5 degree cells; number of hurricanes strikes for the U.S. Atlantic
and Gulf coasts by state and Saffir-Simpson hurricane category; mean
monthly and annual number of extratropical cyclogeneses and cyclone
occurences for the Northern Hemisphere by 5 X 5 degree cells; mean
and/or relative number of cyclones (without regard to cyclone type) for
January, July, and the year for the world by 5 X 5 degree cells; mean
number of hours of cyclone occurence (without regard to cyclone type)
for January, July, and the year for the Southern Hemisphere by 5 X 5
degree cells; mean number of polar lows (polar air cloud vortices) per
winter month for the North Pacific Ocean and Southern Hemisphere by 5 X
5 degree cells; derived index of the influence of winds on coastlines in
the African, Asian, and Australian monsoon regions by 1 X 1 degree
cells; and mean annual sea-ice concentrations for Alaskan and U.S.
coastal areas by 1 X 1 degree cells.

**2. [Element Names and Definitions]{.underline}:**

**Contents of the Magnetic Tape**

The following lists the files distributed on the magnetic tape by Carbon
Dioxide Information Analysis Center (CDIAC). These files are also
available on IBM-formatted floppy diskette as DOS ASCII text files.

+--------+-------------------+------------+---+------------+------------+
| **File | **Description**   | **Logical  |   | **Block    | **Record   |
| nu     |                   | records**  |   | size**     | length**   |
| mber** |                   |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 1      | General           | 915        |   | 8000       | 80         |
|        | descriptive file  |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 2      | FORTRAN IV        | 33         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 5            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 3      | SAS code™ to read | 5          |   | 8000       | 80         |
|        | and print File 5  |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 4      | Annual            | 18426      |   | 8000       | 80         |
|        | probabilities of  |            |   |            |            |
|        | occurrence of     |            |   |            |            |
|        | tropical storms   |            |   |            |            |
|        | and hurricanes    |            |   |            |            |
|        | for coastal areas |            |   |            |            |
|        | of the United     |            |   |            |            |
|        | States, Canada,   |            |   |            |            |
|        | and Bermuda by 1º |            |   |            |            |
|        | x 1º grid cells   |            |   |            |            |
|        | (ARC/INFO™ export |            |   |            |            |
|        | file)             |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 5      | Annual            | 64801      |   | 8000       | 80         |
|        | probabilities of  |            |   |            |            |
|        | occurrence of     |            |   |            |            |
|        | tropical storms   |            |   |            |            |
|        | and hurricanes    |            |   |            |            |
|        | for coastal areas |            |   |            |            |
|        | of the United     |            |   |            |            |
|        | States, Canada,   |            |   |            |            |
|        | and Bermuda by 1º |            |   |            |            |
|        | x 1º grid cells   |            |   |            |            |
|        | (flat ASCII file) |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 6      | FORTRAN IV        | 33         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 9            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 7      | SAS™ code to read | 6          |   | 8000       | 80         |
|        | and print File 9  |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 8      | A. Annual         | 32025      |   | 8000       | 80         |
|        | probabilities of  |            |   |            |            |
|        | occurrence of     |            |   |            |            |
|        | tropical storms,  |            |   |            |            |
|        | hurricanes, and   |            |   |            |            |
|        | super typhoons    |            |   |            |            |
|        | for the world by  |            |   |            |            |
|        | 5º x 5º grid      |            |   |            |            |
|        | cells.            |            |   |            |            |
|        |                   |            |   |            |            |
|        | B. Mean forward   |            |   |            |            |
|        | velocities of     |            |   |            |            |
|        | tropical cyclones |            |   |            |            |
|        | for the world by  |            |   |            |            |
|        | 5º x 5º grid      |            |   |            |            |
|        | cells (ARC/INFO™  |            |   |            |            |
|        | export file)      |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 9      | A. Annual         | 2593       |   | 8000       | 80         |
|        | probabilities of  |            |   |            |            |
|        | occurrence of     |            |   |            |            |
|        | tropical storms,  |            |   |            |            |
|        | hurricanes, and   |            |   |            |            |
|        | super typhoons    |            |   |            |            |
|        | for the world by  |            |   |            |            |
|        | 5º x 5º grid      |            |   |            |            |
|        | cells.            |            |   |            |            |
|        |                   |            |   |            |            |
|        | B. Mean forward   |            |   |            |            |
|        | velocities of     |            |   |            |            |
|        | tropical cyclones |            |   |            |            |
|        | for the world by  |            |   |            |            |
|        | 5º x 5º grid      |            |   |            |            |
|        | cells (flat ASCII |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 10     | FORTRAN IV        | 33         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 13           |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 11     | SAS™ code to read | 6          |   | 8000       | 80         |
|        | and print File 13 |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 12     | Number of         | 1227       |   | 8000       | 80         |
|        | hurricane strikes |            |   |            |            |
|        | for the U.S.      |            |   |            |            |
|        | Atlantic and Gulf |            |   |            |            |
|        | coasts by state   |            |   |            |            |
|        | and               |            |   |            |            |
|        | Saffir-Simpson    |            |   |            |            |
|        | category          |            |   |            |            |
|        | (ARC/INFO™ export |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 13     | Number of         | 43         |   | 8000       | 80         |
|        | hurricane strikes |            |   |            |            |
|        | for the U.S.      |            |   |            |            |
|        | Atlantic and Gulf |            |   |            |            |
|        | coasts by state   |            |   |            |            |
|        | and               |            |   |            |            |
|        | Saffir-Simpson    |            |   |            |            |
|        | category (flat    |            |   |            |            |
|        | ASCII file)       |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 14     | Vector coordinate | 1312       |   | 8000       | 80         |
|        | file of U.S.      |            |   |            |            |
|        | Atlantic and Gulf |            |   |            |            |
|        | states, and state |            |   |            |            |
|        | subdivisions      |            |   |            |            |
|        | (flat ASCII file) |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 15     | FORTRAN IV        | 49         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 18           |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 16     | SAS™ code to read | 11         |   | 8000       | 80         |
|        | and print File 18 |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 17     | A. Mean number of | 42562      |   | 8000       | 80         |
|        | extratropical     |            |   |            |            |
|        | cyclogeneses by   |            |   |            |            |
|        | month and year    |            |   |            |            |
|        | for the Northern  |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells.  |            |   |            |            |
|        |                   |            |   |            |            |
|        | B. Mean number of |            |   |            |            |
|        | extratropical     |            |   |            |            |
|        | cyclone           |            |   |            |            |
|        | occurrences by    |            |   |            |            |
|        | month and year    |            |   |            |            |
|        | for the Northern  |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells   |            |   |            |            |
|        | (ARC/INFO™ export |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 18     | A. Mean number of | 5186       |   | 6600       | 132        |
|        | extratropical     |            |   |            |            |
|        | cyclogeneses by   |            |   |            |            |
|        | month and year    |            |   |            |            |
|        | for the Northern  |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells.  |            |   |            |            |
|        |                   |            |   |            |            |
|        | B. Mean number of |            |   |            |            |
|        | occurrences by    |            |   |            |            |
|        | month and year    |            |   |            |            |
|        | for the Northern  |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells   |            |   |            |            |
|        | (flat ASCII       |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 19     | FORTRAN IV        | 33         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 22           |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 20     | SAS™ code to read | 6          |   | 8000       | 80         |
|        | and print File 22 |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 21     | Mean number of    | 34077      |   | 8000       | 80         |
|        | polar lows (polar |            |   |            |            |
|        | air cloud         |            |   |            |            |
|        | vortices) per     |            |   |            |            |
|        | winter month for  |            |   |            |            |
|        | the North Pacific |            |   |            |            |
|        | Ocean and         |            |   |            |            |
|        | Southern          |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells   |            |   |            |            |
|        | (ARC/INFO™ export |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 22     | Mean number of    | 2593       |   | 8000       | 80         |
|        | polar lows (polar |            |   |            |            |
|        | air cloud         |            |   |            |            |
|        | vortices) per     |            |   |            |            |
|        | winter month for  |            |   |            |            |
|        | the North Pacific |            |   |            |            |
|        | Ocean and         |            |   |            |            |
|        | Southern          |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells   |            |   |            |            |
|        | (flat ASCII file) |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 23     | FORTRAN IV        | 48         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 26           |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 24     | SAS™ code to read | 10         |   | 8000       | 80         |
|        | and print FILE 26 |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 25     | A. Mean and/or    | 47969      |   | 8000       | 80         |
|        | relative number   |            |   |            |            |
|        | of cyclone        |            |   |            |            |
|        | occurrences for   |            |   |            |            |
|        | January, July,    |            |   |            |            |
|        | and the year for  |            |   |            |            |
|        | the world by 5º x |            |   |            |            |
|        | 5º grid cells.    |            |   |            |            |
|        |                   |            |   |            |            |
|        | B. Mean number of |            |   |            |            |
|        | hours of cyclone  |            |   |            |            |
|        | of cyclone        |            |   |            |            |
|        | occurrence for    |            |   |            |            |
|        | January, July,    |            |   |            |            |
|        | and the year for  |            |   |            |            |
|        | the Southern      |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells   |            |   |            |            |
|        | (ARC/INFO™ export |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 26     | A. A. Mean and/or | 2593       |   | 6600       | 132        |
|        | relative number   |            |   |            |            |
|        | of cyclone        |            |   |            |            |
|        | occurrences for   |            |   |            |            |
|        | January, July,    |            |   |            |            |
|        | and the year for  |            |   |            |            |
|        | the world by 5º x |            |   |            |            |
|        | 5º grid cells.    |            |   |            |            |
|        |                   |            |   |            |            |
|        | B. Mean number of |            |   |            |            |
|        | hours of cyclone  |            |   |            |            |
|        | of cyclone        |            |   |            |            |
|        | occurrence for    |            |   |            |            |
|        | January, July,    |            |   |            |            |
|        | and the year for  |            |   |            |            |
|        | the Southern      |            |   |            |            |
|        | Hemisphere by 5º  |            |   |            |            |
|        | x 5º grid cells   |            |   |            |            |
|        | (flat ASCII       |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 27     | FORTRAN IV        | 32         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 30           |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 28     | SAS™ code to read | 5          |   | 8000       | 80         |
|        | and print File 30 |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 29     | Index of the      | 21449      |   | 8000       | 80         |
|        | influence of      |            |   |            |            |
|        | winds on          |            |   |            |            |
|        | coastlines I the  |            |   |            |            |
|        | African, Asian,   |            |   |            |            |
|        | and Australian    |            |   |            |            |
|        | monsoon regions   |            |   |            |            |
|        | by 1º x 1º grid   |            |   |            |            |
|        | cells (ARC/INFO™  |            |   |            |            |
|        | export file).     |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 30     | Index of the      | 64801      |   | 8000       | 80         |
|        | influence of      |            |   |            |            |
|        | winds on          |            |   |            |            |
|        | coastlines I the  |            |   |            |            |
|        | African, Asian,   |            |   |            |            |
|        | and Australian    |            |   |            |            |
|        | monsoon regions   |            |   |            |            |
|        | by 1º x 1º grid   |            |   |            |            |
|        | cells (flat ASCII |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 31     | FORTRAN IV        | 32         |   | 8000       | 80         |
|        | retrieval program |            |   |            |            |
|        | to read and print |            |   |            |            |
|        | File 34           |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 32     | SAS™ code to read | 5          |   | 8000       | 80         |
|        | and print File 34 |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 33     | Mean annual       | 5303       |   | 8000       | 80         |
|        | sea-ice           |            |   |            |            |
|        | concentrations    |            |   |            |            |
|        | for Alaskan and   |            |   |            |            |
|        | U.S. Atlantic     |            |   |            |            |
|        | coastal areas by  |            |   |            |            |
|        | 1º x 1º grid      |            |   |            |            |
|        | cells (ARC/INFO™  |            |   |            |            |
|        | export file).     |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| 34     | Mean annual       | 64801      |   | 8000       | 80         |
|        | sea-ice           |            |   |            |            |
|        | concentrations    |            |   |            |            |
|        | for Alaskan and   |            |   |            |            |
|        | U.S. Atlantic     |            |   |            |            |
|        | coastal areas by  |            |   |            |            |
|        | 1º x 1º grid      |            |   |            |            |
|        | cells (flat ASCII |            |   |            |            |
|        | file).            |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+
| Total  |                   |            |   |            |            |
| r      |                   |            |   |            |            |
| ecords |                   |            |   |            |            |
| 4      |                   |            |   |            |            |
| 13,023 |                   |            |   |            |            |
+--------+-------------------+------------+---+------------+------------+

1\. Tapes are 9 track 6250 BPI with all characters written in EBCDIC
unless otherwise specified by the requester.

2\. All records are stored in a fixed block record format.

3\. ARC/INFO™ export files are coverage's converted to flat ASCII, fixed
block, files for data transfer purposes. You must use the IMPORT command
in ARC/INFO to enter these files into your system.

4\. SAS™ is a registered trademark of the SAS Institute, Inc., Cary NC
27511-8000

5\. ARC/INFO™ is a registered trademark of the Environmental Systems
Research Institute, Inc., Redlands, CA 92372.

**Descriptive File of the Tape**

**Data Group TC10:** Annual probabilities of occurrence of tropical
storms and hurricanes for coastal area of the United States, Canada, and
Bermuda by 1º x 1º grid cells.

The variables in data group TC10 are listed as they appear in TC10.ASC
(File 5) in Table 8.

**Table 8. Variable formats for TC10.ASC (File 5)**

  -------------- -------------- -------------- -------------- -------------------
  **Variable     **Column       **Column end** **Variable     **Variable
  name**         start**                       type**         description**

  Area           1              13             Real           System variable -
                                                              area of each grid
                                                              cell in map units

  Perimeter      14             26             Real           System variable -
                                                              perimeter of each
                                                              grid cell in map
                                                              units

  TC10           27             32             Integer        System
                                                              variable-internal
                                                              grid cell
                                                              identifier

  TC10ID         33             38             Integer        System variable-
                                                              external grid cell
                                                              identifier

  TS             39             47             Real           Data variable-
                                                              annual probability
                                                              of occurrence of
                                                              tropical storms for
                                                              each grid cell

  TY             48             56             Real           Data variable-
                                                              annual probability
                                                              of occurrence of
                                                              hurricanes for each
                                                              grid cell
  -------------- -------------- -------------- -------------- -------------------

Flags are used in data group TC10 for data variable TS and TY under the
following circumstances: (1) when the data record for a given grid cell
provided what was believed to be a false-zero value, and (2) to indicate
areas where tropical cyclones are not known to occur. All flags have
data values greater than 100 and are defined as follows:

200.00 - Indicate that no tropical cyclone activity has been observed
for the given data variable in the given grid cell during the period of
record; however, the grid cell may be an area of rare or occasional
tropical cyclone activity for the data variable at hand.

999.00 - Indicates that tropical cyclones of at least tropical storm
intensity (sustained winds greater than 17.5 m/s) are not known to occur
in the given grid cell (i.e., 999 is equivalent to zero).

**Data Group TC50:** Annual probabilities of occurrence of tropical
storms, hurricanes, and super typhoons for the world by 5º x 5º grid
cells and mean forward velocities of tropical cyclones for the world by
5º x 5º grid cells**.**

The variables in data group TC50 are listed as they appear in TC50.ASC
(File 9) in Table 9.

**Table 9 Variable formats for TC50.ASC (File 9)**

  -------------- -------------- -------------- -------------- -------------------
  **Variable     **Column       **Column end** **Variable     **Variable
  name**         start**                       type**         description**

  Area           1              13             Real           System variable -
                                                              area of each grid
                                                              cell in map units

  Perimeter      14             26             Real           System variable -
                                                              perimeter of each
                                                              grid cell in map
                                                              units

  TC50           27             32             Integer        System
                                                              variable-internal
                                                              grid cell
                                                              identifier

  TC50ID         33             38             Integer        System variable-
                                                              external grid cell
                                                              identifier

  TS             39             47             Real           Data variable-
                                                              annual probability
                                                              of occurrence of
                                                              tropical storms for
                                                              each grid cell

  TY             48             56             Real           Data variable-
                                                              annual probability
                                                              of occurrence of
                                                              hurricanes for each
                                                              grid cell

  STY            57             65             Real           Data variable-
                                                              annual probability
                                                              of occurrence of
                                                              super typhoons for
                                                              each grid cell.

  TCV            66             74             Real           Data variable- mean
                                                              forward velocity of
                                                              tropical cyclones
                                                              (without regard to
                                                              tropical cyclone
                                                              intensity) for each
                                                              grid cell in meters
                                                              per second
  -------------- -------------- -------------- -------------- -------------------

Flags have been added to the data values of data group TC50 for data
variables TS, TY, STY, and TCV under the following circumstances: (1)
when the data record used for a given cell provided what was believed to
be a false-zero value, and (2) to indicate areas where tropical cyclones
are not known to occur. All flags have data values greater than 100.
Each is explained in the following:

200.10 to 299.90 - Indicates that no tropical cyclone activity has been
observed for the given data variable in the given grid cell during the
period of record; however, the grid cell may represent an area of rare
or occasional activity for the data variable at hand.

999.00 - Indicates that tropical cyclones of at least tropical storm
intensity are not known to occur in the given grid cell (i.e., 999 is
equivalent to zero).

A 200 digit in a data value for data variables TS, TY, and STY indicates
that the remaining digits are an estimate of the probability of
occurrence in percent for the given data variable. To obtain the
estimated percent likelihood of occurrences in the given grid cell,
subtract 200.

A 200 digit in a data for data variable TCV indicates that the remaining
digits are an estimate of the mean forward velocity of tropical cyclones
in meters per second. To obtain the estimate mean forward velocity of
tropical cyclones for data variable TCV for a given grid cell, subtract
200.

**Data Group HCSTATE:** Number of hurricane strikes for the U.S.
Atlantic and Gulf Coasts by state and Saffir-Simpson category

The variables in data group HCSTATE are listed as they appear in
HCSTATE.ASC (File 13) in Table 10.

**Table 10 Variable formats for HCSTATE.ASC (File 13)**

  -------------- -------------- -------------- -------------- -------------------
  **Variable     **Column       **Column end** **Variable     **Variable
  name**         start**                       type**         description**

  Area           1              10             Real           System variable -
                                                              area of each grid
                                                              cell in map units

  Perimeter      11             23             Real           System variable -
                                                              perimeter of each
                                                              grid cell in map
                                                              units

  HCSTATE        24             29             Integer        System
                                                              variable-internal
                                                              grid cell
                                                              identifier

  HCSTATEID      30             38             Integer        System variable-
                                                              external grid cell
                                                              identifier

  C1             39             48             Real           Data variable-
                                                              number of hurricane
                                                              centers of
                                                              Saffir-Simpson
                                                              Class 1 that have
                                                              crossed a given
                                                              state or substate
                                                              coastline during
                                                              the period of
                                                              record

  C2             49             53             Real           Data variable-
                                                              number of hurricane
                                                              centers of
                                                              Saffir-Simpson
                                                              Class 2 that have
                                                              crossed a given
                                                              state or substate
                                                              coastline during
                                                              the period of
                                                              record

  C3             54             58             Real           Data variable-
                                                              number of hurricane
                                                              centers of
                                                              Saffir-Simpson
                                                              Class 3 that have
                                                              crossed a given
                                                              state or substate
                                                              coastline during
                                                              the period of
                                                              record

  C4             59             63             Real           Data variable-
                                                              number of hurricane
                                                              centers of
                                                              Saffir-Simpson
                                                              Class 4 that have
                                                              crossed a given
                                                              state or substate
                                                              coastline during
                                                              the period of
                                                              record

  C5             64             68             Real           Data variable-
                                                              number of hurricane
                                                              centers of
                                                              Saffir-Simpson
                                                              Class 5 that have
                                                              crossed a given
                                                              state or substate
                                                              coastline during
                                                              the period of
                                                              record
  -------------- -------------- -------------- -------------- -------------------

Table 11 lists the geographic name and polygon ID for each polygon in
this data group.

**Table 11 Geographic names of each polygon in data group HCSTATE (Files
12, 13, and 14)**

  ----------------- ----------------- ----------------- -----------------
  **HCSTATE-ID**    **Location**      **HCSTATE-ID**    **Location**

  1                 Maine             2                 N. Hampshire

  3                 New York          4                 Massachusetts

  5                 Pennsylvania      6                 Connecticut

  7                 Rhode Island      8                 New Jersey

  9                 New York          10                Delaware

  11                Maryland          12                Virginia

  13                Virginia          14                N. Carolina

  15                N. Carolina       16                Northern Texas

  17                N. Carolina       18                N. Carolina

  19                S. Carolina       20                Alabama

  21                Mississippi       22                Georgia

  23                Louisianan        24                Central Texas

  25                NW Florida        26                NE Florida

  27                NW Florida        28                NE Florida

  29                Northern Texas    30                NE Florida

  31                Southern Texas    32                NE Florida

  33                NE Florida        34                SE Florida

  35                SE Florida        36                SE Florida

  37                Central Texas     38                SW Florida

  39                SW Florida        40                Southern Texas

  41                Southern Texas    42                SW Florida
  ----------------- ----------------- ----------------- -----------------

Table 12 displays an example of the format of the data within
HCSTATE.BNA (File 14), which contains the vector boundaries for the data
within this group.

**Table 12 Sample listing form the vector coordinate file HCSTATE.BNA
(File 14)**

+-----------------------------------+-----------------------------------+
| **Format: Polygon ID, number of   |                                   |
| vertices in polygon longitude,    |                                   |
| latitude.**                       |                                   |
+-----------------------------------+-----------------------------------+
| "1",59                            | Point 1                           |
|                                   |                                   |
| -71.088,45.3014                   |                                   |
+-----------------------------------+-----------------------------------+
| -70.6407,45.4194                  |                                   |
+-----------------------------------+-----------------------------------+
| -70.5033,45.6806                  |                                   |
+-----------------------------------+-----------------------------------+
| -70.2455,45.9355                  |                                   |
+-----------------------------------+-----------------------------------+
| -70.279,46.1999                   |                                   |
+-----------------------------------+-----------------------------------+
| -70.0352,46.4806                  |                                   |
+-----------------------------------+-----------------------------------+
| -69.8728,46.8154                  |                                   |
+-----------------------------------+-----------------------------------+
| -69.5779,47.1142                  |                                   |
+-----------------------------------+-----------------------------------+
| -69.0446,47.4105                  |                                   |
+-----------------------------------+-----------------------------------+
| -69.0446,47.2721                  | Point 10                          |
+-----------------------------------+-----------------------------------+
| \...                              |                                   |
+-----------------------------------+-----------------------------------+
| -71.088,45.3014                   | Point 59, closes program          |
+-----------------------------------+-----------------------------------+
| "2",16                            | Point 1                           |
+-----------------------------------+-----------------------------------+
| \...                              |                                   |
+-----------------------------------+-----------------------------------+

No flags are added to the data variables of data group HCSTATE. However,
data values for the five data variables are not directly comparable
between different polygons. This results from different coastal lengths
represented by each of the state and substate polygons.

Twenty-four states and substates represent separate data entities in
this data group. These 24 entities, however, are described by 42
polygons in the data group. The additional polygons are inlands and/or
fragments of various states or substates, which are separated from the
main body of the state of substate to which they belong. Each island
polygon contains the dame data values as the state or substate of which
it is a part.

**Data Group XCNORTH:** Mean number of extratropical cyclogeneses by
month and year for the northern hemisphere by 5º x 5º grid cells and the
mean number of extratropical cyclone occurrences by month and year for
the northern hemisphere by 5º x 5º grid cells.

The variables in data group XCNORTH are listed as they appear in
XCNORTH.ASC (File 18) in Table 13.

**Table 13 Variable formats for XCNORTH.ASC (File 18)**

  -------------- -------------- -------------- -------------- -------------------
  Variable name  Column start   Column end     Variable type  Variable
                                                              description

  Area           1              12             Real           System variable -
                                                              area of each grid
                                                              cell in map units

  Perimeter      13             24             Real           System variable -
                                                              perimeter of each
                                                              grid cell in map
                                                              units

  XCNORTH        25             29             Integer        System
                                                              variable-internal
                                                              grid cell
                                                              identifier

  XCNORTHID      30             34             Integer        System variable-
                                                              external grid cell
                                                              identifier

  CGJA           35             42             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              January for each
                                                              grid cell

  CFJA           43             50             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per January for
                                                              each grid cell

  CGFE           51             58             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              February for each
                                                              grid cell

  CFFE           59             66             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per February for
                                                              each grid cell

  CGMR           67             74             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              March for each grid
                                                              cell

  CFMR           75             82             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per March for each
                                                              grid cell

  CGAP           83             90             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              April for each grid
                                                              cell

  CFAP           91             98             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per April for each
                                                              grid cell

  CGMY           99             106            Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              May for each grid
                                                              cell

  CFMY           107            114            Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per May for each
                                                              grid cell

  CGJN           115            122            Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              June for each grid
                                                              cell

  The following                                               
  line reads                                                  

  CFJN           1              8              Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per June for each
                                                              grid cell

  CGJL           9              16             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              July for each grid
                                                              cell

  CFJL           17             24             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per July for each
                                                              grid cell

  CGAG           25             32             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              August for each
                                                              grid cell

  CFAG           33             40             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per August for each
                                                              grid cell

  CGSP           41             48             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              September for each
                                                              grid cell

  CFSP           41             48             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per September for
                                                              each grid cell

  CGOB           57             64             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              October for each
                                                              grid cell

  CFOB           65             72             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per October for
                                                              each grid cell

  CGNV           73             80             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              November for each
                                                              grid cell

  CFNV           81             88             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per November for
                                                              each grid cell

  CGDC           89             96             Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              December for each
                                                              grid cell

  CFDC           97             104            Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per December for
                                                              each grid cell

  CGAN           105            112            Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclogeneses per
                                                              year for each cell

  CFAN           113            120            Real           Data variable- mean
                                                              number of
                                                              extratropical
                                                              cyclone occurrences
                                                              per year for each
                                                              grid cell
  -------------- -------------- -------------- -------------- -------------------

Flags are added to the data value of data group XCNORTH under the
following circumstances: (1) to indicate Northern Hemisphere "tropical"
zones and (2) to indicate the unavailability of data. Flagged data
always have values greater than 100. The flags are defined as follows:

888.00 - Indicates that the data value is referenced to a 5º x 5º grid
cell that is located between 0º and 20º North latitude. Polygons within
this area are generally tropical in nature. As a result, extratropical
cyclone activity is either rare or nonexistent.

999.00 - This data value indicated that no data are available for the
given grid cell.

This data group has not been significantly corrected for latitudinal
differences in the sizes of 5º x 5º grid cells of latitude-longitude.
Extratropical cyclone occurrence data variables (those beginning with
CF) have received no area corrections. The extratropical cyclogeneses
data variable (those beginning with CG) have been slightly corrected for
latitudes above 65º North.

**Data Group POLARLOW:** Mean number of polar lows per winter month for
the North Pacific Ocean and Southern Hemisphere by 5º x 5º grid cells.

The variables in data group POLARLOW are listed as they appear I
POLARLOW.ASC (File 22) in Table 14.

**Table 14 Variable formats for POLARLOW.ASC (File 22)**

  -------------- -------------- -------------- -------------- -------------------
  **Variable     **Column       **Column end** **Variable     **Variable
  name**         start**                       type**         description**

  Area           1              13             Real           System variable -
                                                              area of each grid
                                                              cell in map units

  PERIMETER      14             26             Real           System variable -
                                                              perimeter of each
                                                              grid cell in map
                                                              units

  PLOW           27             32             Integer        System
                                                              variable-internal
                                                              grid cell
                                                              identifier

  PLOWID         33             38             Integer        System variable-
                                                              external grid cell
                                                              identifier

  COMMA          39             47             Real           Data variable- mean
                                                              number of
                                                              comma-form polar
                                                              lows per winter
                                                              month for each grid
                                                              cell

  SPIRAL         48             56             Real           Data variable- mean
                                                              number of polar
                                                              lows per winter
                                                              month (comma-and
                                                              spiral-form) for
                                                              each grid cell
  -------------- -------------- -------------- -------------- -------------------

The following flags are added to the data Values group POLARLOW in order
to (1) indicate area of possible rare polar-low occurrence and (2)
indicate the unavailability of data. Flagged data always have been
greater than 100. The two types of flags in the data values are
explained below:

200.00 - Indicates that polar-low occurrence is a possibility in the
given Grid cell; however, the period of record was not sufficient to
indicate polar-low activity. This flag was used only for data variable
POLARLOW.

999.00 - Indicates that data on the occurrence of polar lows are not
available for the given grid cell.

The polar-low climatology here describes the occurrences of polar lows
in all formative and most mature stages of development (polar-low types
6, 7, 21, and 22 as used in the data sources. Polar lows in the decaying
stage of their life cycles are not included in this climatology.

**Data Group LOWPC:** Mean and /or relative number of cyclones for
January, July, and the year for the world by 5º x 5º grid cells and the
mean number of hours of cyclone occurrences for January, July, and the
year for the Southern Hemisphere by 5º x 5º grid cells

The variables in data group LOWPC are listed as they appear in LOWPC.ASC
(File 26) in Table 15.

**Table 15 Variable formats for LOWPC.ASC (File 26)**

  -------------- ------------- ------------- -------------- -------------------
  **Variable     **Column      **Column      Variable type  Variable
  name**         start**       end**                        description

  Area           1             12            Real           System variable -
                                                            area of each grid
                                                            cell in map units

  Permiter       13            25            Real           System variable -
                                                            perimeter of each
                                                            grid cell in map
                                                            units

  LOWPC          26            31            Integer        System
                                                            variable-internal
                                                            grid cell
                                                            identifier

  LOWPCID        32            37            Integer        System variable-
                                                            external grid cell
                                                            identifier

  ZONE           38            43            Integer        Data variable- the
                                                            climate zone to
                                                            which a given grid
                                                            cell is assigned
                                                            (i.e., 1 =
                                                            trolical, 2 -
                                                            extratropical)

  LOWNJA         44            52            Real           Data variable- the
                                                            mean number of
                                                            cyclone occurrences
                                                            per January for
                                                            each grid cell
                                                            (Northern
                                                            Hemisphere)

  LOWNJL         53            61            Real           Data variable- the
                                                            mean number of
                                                            cyclone occurrences
                                                            per July for each
                                                            grid cell (Northern
                                                            Hemisphere)

  LOWNAN         62            70            Real           Data variable- the
                                                            mean number of
                                                            cyclone occurrences
                                                            per year for each
                                                            grid cell (Northern
                                                            Hemisphere)

  LOWSJA         71            79            Real           Data variable- the
                                                            mean number of
                                                            cyclone occurrences
                                                            per January for
                                                            each grid cell
                                                            (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  LOWSJL         80            88            Real           Data variable- the
                                                            mean number of
                                                            cyclone occurrences
                                                            per July for each
                                                            grid cell (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  LOWSAN         89            97            Real           Data variable- the
                                                            mean number of
                                                            cyclone occurrences
                                                            per year for each
                                                            grid cell (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  LOW2JA         98            106           Real           Data variable- the
                                                            mean number hours
                                                            of cyclone
                                                            occurrences per
                                                            January for each
                                                            grid cell (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  The following                                             
  line reads:                                               

  LOWS2JL        1             8             Real           Data variable- the
                                                            mean number hours
                                                            of cyclone
                                                            occurrences per
                                                            July for each grid
                                                            cell (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  LOWS2AN        9             17            Real           Data variable- the
                                                            mean number hours
                                                            of cyclone
                                                            occurrences per
                                                            year for each grid
                                                            cell (Southern
                                                            Hemisphere outside
                                                            Australian Region

  LOWAJA         18            26            Real           Data variable- the
                                                            mean number cyclone
                                                            occurrences per
                                                            January for each
                                                            grid cell
                                                            (Australian Region)

  LOWAJL                                                    Data variable- the
                                                            mean number cyclone
                                                            occurrences per
                                                            July for each grid
                                                            cell (Australian
                                                            Region)

  LOWAAN                                                    Data variable- the
                                                            mean number cyclone
                                                            occurrences per
                                                            year for each grid
                                                            cell (Australian
                                                            Region)

  LOWA2JA                                                   Data variable- the
                                                            mean number hours
                                                            of cyclone
                                                            occurrences per
                                                            January for each
                                                            grid
                                                            cell(Australian
                                                            Region)

  LOWA2JL                                                   Data variable- the
                                                            mean number hours
                                                            of cyclone
                                                            occurrences per
                                                            July for each grid
                                                            cell (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  LOWA2AN                                                   Data variable- the
                                                            mean number hours
                                                            of cyclone
                                                            occurrences per
                                                            year for each grid
                                                            cell (Southern
                                                            Hemisphere outside
                                                            Australian Region)

  CYCJA                                                     Data variable-
                                                            statistically
                                                            standardized data
                                                            value calculated by
                                                            subtracting the
                                                            given data source
                                                            mean number of
                                                            cyclones centers
                                                            present per 5º x 5º
                                                            grid cell per
                                                            January from the
                                                            mean number of
                                                            cyclone centers
                                                            present in a given
                                                            5º x 5º grid cell
                                                            per January and
                                                            then dividing by
                                                            the standard
                                                            deviation of the
                                                            given data source
                                                            mean number of
                                                            cyclone centers
                                                            present per 5º x 5º
                                                            grid cell per
                                                            January (i.e., the
                                                            global distribution
                                                            of cyclones in
                                                            January)

  CYCJL          81            89            Real           Data variable-
                                                            statistically
                                                            standardized data
                                                            value calculated by
                                                            subtracting the
                                                            given data source
                                                            mean number of
                                                            cyclones centers
                                                            present per 5º x 5º
                                                            grid cell per July
                                                            from the mean
                                                            number of cyclone
                                                            centers present in
                                                            a given 5º x 5º
                                                            grid cell per July
                                                            and then dividing
                                                            by the standard
                                                            deviation of the
                                                            given data source
                                                            mean number of
                                                            cyclone centers
                                                            present per 5º x 5º
                                                            grid cell per July
                                                            (i.e., the global
                                                            distribution of
                                                            cyclones in July)

  CYCLONE        90            98            Real           Data variable-
                                                            statistically
                                                            standardized data
                                                            value calculated by
                                                            subtracting the
                                                            given data source
                                                            mean number of
                                                            cyclones centers
                                                            present per 5º x 5º
                                                            grid cell per year
                                                            from the mean
                                                            number of cyclone
                                                            centers present in
                                                            a given 5º x 5º
                                                            grid cell per year
                                                            and then dividing
                                                            by the standard
                                                            deviation of the
                                                            given data source
                                                            mean number of
                                                            cyclone centers
                                                            present per 5º x 5º
                                                            grid cell per year
                                                            (i.e., the annual
                                                            global distribution
                                                            of cyclones)
  -------------- ------------- ------------- -------------- -------------------

The following flag is added to the data values of data group LOWPC to
aid in the data interpretation.

999.00 - Indicates that data for the given data variable are not
available for the given grid cell.

Data variables CYCJA, CYCJL, and CYCLONE are expressed in deviations
from the mean, where the mean and standard deviation for each data
source was obtained and used to convert the values in each grid cell
into a standardized value. The standardized data values for each 5º x 5º
grid cell in each data region were then used to form the three global
data variables for January, July, and the year (see appendix A for a
description of the methods used in obtaining the global data variables).

Comparison of the number of cyclones and/or cyclonicity data between
area using different data sources should be undertaken with caution.
Although data variables CYCJA, CYCJL, and CYCLONE adequately standardize
the data sources for most uses, differences in data analysis and
presentation in the original data sources cannot be entirely ignored.
Two particular area of caution concerning data source differences are
(1) the number of cyclone observations used in obtaining the original
cyclone frequencies and (2) the resolution of the isobar analysis used
(i.e., 4-hPa, 5-hPa, or 10-hPa).

**Data Group MONSOON:** Index of the influence of winds on coastlines in
the African, Asian and Australian monsoon regions by 1º x 1º grid cells.

The variables in data group MONSOON are listed as they appear in
MONSOON.ASC (File 30) in Table 16.

**Table 16 Variable formats for MONSOON.ASC (File 30)**

  -------------- -------------- -------------- -------------- ---------------
  **Variable     **Column       **Column end** **Variable     **Variable
  name**         start**                       type**         description**

  AREA           1              13             Real           System
                                                              variable- area
                                                              of each grid
                                                              cell in map
                                                              units

  PERIMETER      14             26             Real           System
                                                              variable-
                                                              perimeter of
                                                              each grid cell
                                                              in map units

  MON            27             32             Integer        System
                                                              variable-
                                                              internal grid
                                                              cell identifier

  MONID          33             38             Integer        System
                                                              variable-
                                                              external grid
                                                              cell identifier

  MONSOON        39             43             Real           Data variable-
                                                              a numeric index
                                                              of the relative
                                                              influence of
                                                              onshore winds
                                                              on coastlines
                                                              of monsoon
                                                              regions for
                                                              each grid cell
  -------------- -------------- -------------- -------------- ---------------

The following flag is added to the data values of data group MONSOON to
aid in data interpolation.

999 - Indicates that data for the given variable are not available for
the given grid cell.

**Data group SEAICE:** Mean annual sea-ice concentration for Alaskan and
U.S. Atlantic Coastal area by 1º x 1º grid cells.

The variable in data group SEAICE are listed as they appear in
SEAICE.ASC (File 34) in Table 17.

**Table 17 Variable formats for SEAICE.ASC (File 34)**

  -------------- -------------- -------------- -------------- ---------------
  **Variable     **Column       **Column end** **Variable     **Variable
  name**         start**                       type**         description**

  AREA           1              13             Real           System
                                                              variable- area
                                                              of each grid
                                                              cell in map
                                                              units

  PERIMETER      14             26             Real           System
                                                              variable-
                                                              perimeter of
                                                              each grid cell
                                                              in map units

  SEA            27             32             Integer        System
                                                              variable-
                                                              internal grid
                                                              cell identifier

  SEAID          33             38             Integer        System
                                                              variable-
                                                              external grid
                                                              cell identifier

  ICE            39             43             Real           Data variable-
                                                              mean annual
                                                              concentration
                                                              of sea ice in
                                                              percent for
                                                              each grid cell
  -------------- -------------- -------------- -------------- ---------------

Calculations of sea-ice concentrations are limited to a 1º x 1º grid
cells of latitude-longitude that contain significant U.S. coastlines.
Therefore, the flat ASCII file (File 34) of data group SEAICE has only
297 grid cells out of the 64,800 possible that contain real data. Grid
cells not containing real data values are flagged with the following
data value:

99.0 - Indicates that no data value for sea-ice concentration has been
calculated for the given grid cell.

**3. [Start Date]{.underline}:** 18990101

**4. [Stop Date]{.underline}:** 19901231

**5. [Coverage]{.underline}:**

a\. Southernmost Latitude: -90.0S

b\. Northernmost Latitude: 90.0N

c\. Westernmost Longitude: -180.0W

d\. Easternmost Longitude: 180.0E

**6. [How to Order Data]{.underline}:**

Ask NCDC's Climate Services about the cost of obtaining this data set.

Phone: 828-271-4800

FAX: 828-271-4876

E-mail: [**NCDC.Orders@noaa.gov**](mailto:NCDC.Orders@noaa.gov)

**7. [Archiving Data Center]{.underline}:**

Archive Branch

National Climatic Data Center

151 Patton Avenue

Asheville, NC 28801

**8. [Technical Contact]{.underline}:**

National Climatic Data Center

151 Patton Avenue

Asheville, NC 28801

**9. [Known Uncorrected Problems]{.underline}:** None.

**10. [Quality Statement]{.underline}:**

**11. [Essential Companion Datasets]{.underline}:**

**12. [References]{.underline}:**

**Appendix A**

**Techniques used to compile data groups and variables**

Because of the large number of data sources used, methods employed to
obtain the 61 data variables in this NDP vary widely. Figure A-1 lists
the eight data groups and the data variables associated with each. More
information about specific procedures used in the derivation of data
variables of each individual data group can be found in the Active
Archives Branch.

Fig. A-1. NDP-035 data group names and associated data variable names.

**Table A-1** **Data groups of NDP-035; each data group is described by
its name and contents.**

+-------+--------------------------------------------------------------+
| **N   | **Description of Contents**                                  |
| ame** |                                                              |
+-------+--------------------------------------------------------------+
| TC10  | Annual probabilities of occurrence of tropical storms and    |
|       | hurricanes for coastal areas of the United States, Canada,   |
|       | and Bermuda by 1º x 1º grid cells.                           |
+-------+--------------------------------------------------------------+
| TC50  | \(a\) Annual probabilities of occurrence of tropical storms, |
|       | hurricanes, and super typhoons (winds 67 m/s or greater) for |
|       | the world by 5º x 5º grid cells                              |
|       |                                                              |
|       | \(b\) Mean forward velocities of tropical cyclones (without  |
|       | regard to tropical cyclone intensity) for the world by 5º x  |
|       | 5º grid cells.                                               |
+-------+--------------------------------------------------------------+
| HC    | The number of hurricane strikes for the U.S. Atlantic and    |
| STATE | Gulf Coasts by state and Saffir-Simpson hurricane category.  |
+-------+--------------------------------------------------------------+
| XC    | \(a\) Mean monthly and annual number of extratropical        |
| NORTH | cyclogeneses for the Northern Hemisphere by 5º x 5º grid     |
|       | cells.                                                       |
|       |                                                              |
|       | \(b\) Mean monthly and annual number of extratropical        |
|       | cyclone occurrences for the Northern Hemisphere by 5º x 5º   |
|       | grid cells.                                                  |
+-------+--------------------------------------------------------------+
| POL   | Mean number of polar lows (polar air cloud vortices) per     |
| ARLOW | winter month for the North Pacific Ocean and Southern        |
|       | Hemisphere by 5º x 5º gird cells                             |
+-------+--------------------------------------------------------------+
| LOWPC | \(a\) Mean and/or relative number of cyclones (without       |
|       | regard to cyclone type) for January, July and the year for   |
|       | the world by 5º x 5º grid cells.                             |
|       |                                                              |
|       | \(b\) Mean number of hours of cyclone occurrence (without    |
|       | regard to cyclone type) for January, July and the year for   |
|       | the Southern Hemisphere by 5º x 5º grid cells.               |
+-------+--------------------------------------------------------------+
| MO    | Derived index of the influence of winds on coastlines in the |
| NSOON | African, Asian and Australian monsoon regions by 1º x 1º     |
|       | grid cells.                                                  |
+-------+--------------------------------------------------------------+
| S     | Mean annual sea-ice concentrations for Alaskan and U.S.      |
| EAICE | Atlantic coastal areas by 1º x 1º grid cells.                |
+-------+--------------------------------------------------------------+