-------- Original Message --------
560
NOUS41 KWBC 221935
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 08-99
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
235 PM EST MON DEC 22 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: GLOBAL FORECAST SYSTEM CHANGES: EFFECTIVE
FEBRUARY 10 2009
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 USED
7. 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.YYYYMMDD
THERE 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@xxxxxxxx
NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE ONLINE AT
/USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM
$$
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