NOUS41 KWBC 142020 AAA
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 08-69 AMENDED
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
320 PM EST FRI NOV 14 2008

TO:       SUBSCRIBERS:
          -FAMILY OF SERVICES
          -NOAA WEATHER WIRE SERVICE
          -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
          OTHER NWS PARTNERS...USERS AND EMPLOYEES

FROM:     JASON TUELL
          CHIEF...SCIENCE PLANS BRANCH
          OFFICE OF SCIENCE AND TECHNOLOGY

SUBJECT:  AMENDED TO CHANGE DATE: ADDITION OF NEW ELEMENTS TO THE
          GFS-BASED GRIDDED MOS GUIDANCE FOR ALASKA: EFFECTIVE
          DECEMBER 16 2008

REFER TO: TECHNICAL IMPLEMENTATION NOTICE /TIN/ 08-69
          TRANSMITTED ON SEPTEMBER 3 2008

AMENDED TO POSTPONE THE EFFECTIVE DATE FROM NOVEMBER 18 2008 TO 
DECEMBER 16 2008 DUE TO THE NEED FOR ADDITIONAL TESTING. IN 
ADDITION THE AREA WITHIN THE NDFD GRID FOR WHICH VALID FORECASTS 
ARE AVAILABLE IS BEING EXPANDED AT THE REQUEST OF NWS FORECASTERS 
IN ALASKA. THE ORIGINAL NOTICE...WITH REVISED DATE IS BELOW:

EFFECTIVE TUESDAY DECEMBER 16 2008...BEGINNING WITH THE 1200 
COORDINATED UNIVERSAL TIME /UTC/ RUN...NWS WILL PRODUCE 
ADDITIONAL ELEMENTS IN THE GLOBAL FORECAST SYSTEM /GFS/ -BASED 
GRIDDED MOS GUIDANCE FOR ALASKA. THESE GUIDANCE PRODUCTS WILL BE 
DISSEMINATED ON THE SATELLITE BROADCAST NETWORK /SBN/... NOAAPORT 
...AND THE NWS FTP SERVER. THE PRODUCTS WILL BE IN GRIB2 FORMAT. 
THE COMMUNICATION IDENTIFIERS 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 BE MADE AVAILABLE FOR THE FOLLOWING ADDITIONAL 
ELEMENTS:

  WIND SPEED
  WIND DIRECTION
  WIND GUSTS
  6- AND 12-HR PROBABILITY OF PRECIPITATION /POP/
  SKY COVER

GRIDDED MOS GUIDANCE FOR ALASKA IN GRIB2 IS AVAILABLE ON THE NWS 
FTP SERVER AT /USE LOWER CASE EXCEPT FOR 
SL...ST...DF...DC...GT...AND AR/:

FTP://TGFTP.NWS.NOAA.GOV/SL.US008001/ST.EXPR/DF.GR2/DC.NDGD/GT.MO
SGFS/AR.ALASKA

TABLE 1: COMMUNICATION IDENTIFIERS FOR THE GFS-BASED GRIDDED MOS 
GRIB2 PRODUCTS FOR ALASKA SCHEDULED TO BE IMPLEMENTED.  EACH 
GRIB2 PRODUCT HAS A UNIQUE WMO HEADING. LISTED BELOW ARE 
REPRESENTATIONS OF THE WMO HEADINGS.  A COMPLETE LIST OF GRIDDED 
MOS WMO HEADINGS IS AVAILABLE AT /USE LOWERCASE/:

  HTTP://WWW.NWS.NOAA.GOV/MDL/SYNOP/GMOS/GMOSHEADERS.PDF

WMO HEADING          ELEMENT

LCRXXX KWBQ          WIND SPEED
LBRXXX KWBQ          WIND DIRECTION
LWRXXX KWBQ          WIND GUSTS 
LURXXX KWBQ          6-HR POP
LDRXXX KWBQ          12-HR POP
LARXXX KWBQ          SKY COVER

A WEB PAGE OUTLINING THE GRIDDED MOS GUIDANCE AND THE FTP SERVER 
STRUCTURE CAN BE FOUND AT /USE LOWERCASE/:

  HTTP://WWW.NWS.NOAA.GOV/MDL/SYNOP/GMOS.PHP

FOR QUESTIONS ABOUT THESE PRODUCTS OR THE MOS GUIDANCE 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 AT /USE LOWERCASE/:
  
  HTTP://WWW.NWS.NOAA.GOV/MDL/SYNOP

TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWERCASE/:

  HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM

$$
NNNN