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-------- Original Message --------659 NOUS41 KWBC 081842
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 08-99 AMENDED
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
142 PM EST THU JAN 8 2009
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: GLOBAL FORECAST SYSTEM CHANGES: EFFECTIVE
FEBRUARY 24 2009
REFER TO: TECHNICAL IMPLEMENTATION NOTICE /TIN/ 08-99 TRANSMITTED ON DECEMBER 22 2008
AMENDED TO DELAY THE EFFECTIVE DATE FROM FEBRUARY 10 2009 TO FEBRUARY 24 2009. THE CHANGE WILL ALLOW ADDITIONAL TIME FOR SUBJECTIVE EVALUATION. THE ORIGINAL NOTICE...WITH THE REVISED DATE...IS BELOW:
EFFECTIVE TUESDAY FEBRUARY 10 2009...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE GLOBAL ANALYSIS SYSTEM WILL BE MODIFIED TO INCLUDE CHANGES IN THE OBSERVATIONS USED IN THE ANALYSIS AND IN THE FORMULATION OF THE ANALYSIS. THESE CHANGES ARE EXPECTED TO IMPROVE PERFORMANCE OF THE GLOBAL FORECAST AND ASSIMILATION SYSTEM. THE CHANGES TO THE GLOBAL ANALYSIS SYSTEM /A GLOBAL APPLICATION OF THE GRID-POINT STATISTICAL INTERPOLATION /GSI/ SYSTEM/ INCLUDE: 1. INCLUSION OF METOP IASI DATA
2. USE OF VARIATIONAL QC 3. CHANGE IN LAND/SNOW/ICE SKIN TEMPERATURE VARIANCE 4. FLOW DEPENDENT REWEIGHTING OF BACKGROUND ERROR VARIANCES 5. ADDITION OF BACKGROUND ERROR COVARIANCE INPUT FILE 6. REDUCTION OF NUMBER OF AIRS WATER VAPOR CHANNELS USED7. USE OF NEW VERSION AND COEFFICIENTS FOR COMMUNITY RADIATIVE TRANSFER MODEL
8. MODIFICATION OF HEIGHT ASSIGNMENT FOR HEIGHT BASED WIND
OBSERVATIONS
9. MODIFICATION OF SURFACE LAND USE FILE TO REMOVE A FEW
PERMANENT /~12/ GLACIAL POINTS TO IMPROVE SURFACE
TEMPERATURE FORECASTS OVER THOSE POINTS.
DATA DELIVERY TIMING WILL NOT BE IMPACTED BY THIS IMPLEMENTATION.
THE GFS DELIVERY TIME WILL NOT CHANGE.
TEST DATA WILL BE AVAILABLE ON 22 DECEMBER VIA THE NCEP FTP SERVER AT THE FOLLOWING LOCATIONS /USE LOWERCASE LETTERS/:
FTP://FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PARA/GFS.YYYYMMDD FTP://FTPPRD.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PARA/GDAS.YYYYMMDDTHERE WILL BE NO CHANGE IN THE FORMAT OR CONTENT OF THE DATA VIA ALL DISSEMINATION ROUTES THAT INCLUDE NOAAPORT...THE NWS PUBLIC FTP SERVER AND THE NCEP PUBLIC FTP SERVER. FOR QUESTIONS CONCERNING THESE CHANGES...PLEASE CONTACT:
JOHN H. WARD NCEP...GLOBAL MODELING BRANCH CAMP SPRINGS MARYLAND 301-763-8000 X7185 JOHN.WARD@xxxxxxxx OR JOHN DERBER NCEP CAMP SPRINGS MARYLAND 301-763-8000 X7740 JOHN.DERBER@xxxxxxxxNWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE ONLINE AT /USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM $$
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