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PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 07-82 AMENDED

NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC

XXXX XM EDT XXX XXX XX 2008

TO: SUBSCRIBERS:

-FAMILY OF SERVICES

-NOAA WEATHER WIRE SERVICE

-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK

-NOAAPORT

OTHER NWS PARTNERS\...USERS AND EMPLOYEES

FROM: JASON TUELL

CHIEF\...SCIENCE PLANS BRANCH

OFFICE OF SCIENCE AND TECHNOLOGY

SUBJECT: AMENDED: ADDITION OF GFS-BASED GRIDDED MOS GUIDANCE FOR ALASKA:
EFFECTIVE JUNE 10 2008

REFER TO: 1. TECHNICAL IMPLEMENTATION NOTICE /TIN/ 07-82

TRANSMITTED ON OCTOBER 24 2007

2\. TECHNICAL IMPLEMENTATION NOTICE /TIN/ 07-82: AMENDED

TRANSMITTED ON FEBRUARY 25 2008

Amended to notify users of the new effective date for adding Alaska
gridded MOS guidance. The implementation date is set for June 10 2008.

Effective Tuesday June 10 2008\...the NWS will produce new Global
Forecast System /GFS/ -based gridded MOS guidance for Alaska and
disseminate it on the Satellite Broadcast Network
/SBN/\...NOAAPORT\...and the NWS FTP server. These guidance products
will be in GRIB2 format. The new communication identifiers for these
products are shown in table 1 below.

The gridded MOS products will contain guidance on a roughly 3 km polar
stereographic grid covering the same expanse as the National Digital
Forecast Database /NDFD/ Alaska grid. Grids will be generated from the
0000 and 1200 Universal Coordinated Time /UTC/ model runs at projections
of 1 to 7 days in advance. Guidance will initially be available for the
following elements with others to be added at a later date:

Daytime maximum and nighttime minimum temperature

2-meter spot temperature

2-meter spot dewpoint temperature

Relative humidity

Probability of thunderstorms /3\...6 and 12 hour/

The Alaska probability of thunderstorm guidance will only be valid
during the warm season from May 1 through September 30.

A web page providing more information regarding grid
specifications\...grib2 encoding and elements for which guidance is
available is referenced below.

The grib2 products will be provided as part of the national digital
guidance database /ndgd/. They will initially be available on the nws
ftp server at:

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.mosgfs/AR.alaska

Table 1: Communication identifiers for the GFS-based gridded MOS GRIB2
products for Alaska. Each GRIB2 product has a unique WMO header. Listed
below are representations of the WMO headers. A complete list of gridded
MOS WMO headers is available at:

http://www.nws.noaa.gov/mdl/synop/gmos/gmosheaders.pdf

WMO HEADING ELEMENT

LBRXXX KWBQ Wind direction

LCRXXX KWBQ Wind speed

LDRXXX KWBQ 12-hr probability of precipitation

LERXXX KWBQ 2-meter temperature

LFRXXX KWBQ 2-meter dew point temperature

LGRXXX KWBQ Daytime maximum temperature

LHRXXX KWBQ Nighttime minimum temperature

LJRXXX KWBQ 6-hr probability of thunderstorms

LRRXXX KWBQ Relative humidity

LURXXX KWBQ 6-hr probability of precipitation

LXRXXX KWBQ 12-hr probability of thunderstorms

LYRXXX KWBQ 3-hr probability of thunderstorms

A web page outlining the gridded MOS guidance and the FTP server
structure can be found online at:

http://www.nws.noaa.gov/mdl/synop/gmos.php

If you have questions about these products or the MOS guidance\...
please contact:

> Kathryn Gilbert
>
> MDL/Silver Spring Maryland
>
> Phone: 301-713-0023 ext. 130
>
> E-mail: kathryn.gilbert@noaa.gov

Links to the MOS products\...along with descriptions\...can be found
online at:

http://www.nws.noaa.gov/mdl/synop

This and other NWS Technical Implementation Notices can be found online
at:

http://www.nws.noaa.gov/om/notif.htm

\$\$

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