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-------- Original Message --------048 NOUS41 KWBC 291927
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 09-34 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 330 PM EDT TUE SEP 29 2009 TO: SUBSCRIBERS:-FAMILY OF SERVICES -NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS...USERS AND EMPLOYEES
FROM: TIM MCCLUNG
SCIENCE PLANS BRANCH CHIEF
OFFICE OF SCIENCE AND TECHNOLOGY
SUBJECT: GLOBAL ENSEMBLE FORECAST SYSTEM/NORTH AMERICAN
ENSEMBLE FORECAST SYSTEM CHANGES:
EFFECTIVE DECEMBER 15 2009
EFFECTIVE DECEMBER 15 2009...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL UPGRADE THE GLOBAL ENSEMBLE FORECAST SYSTEM /GEFS/. CHANGES INCLUDE MODEL UPGRADES...CHANGES TO THE GRIB ENCODING OF CURRENT PRODUCTS...INCLUSION OF NEW PARAMETERS AND CHANGES TO THE LOCATIONS OF SOME EXISTING PARAMETERS CURRENTLY AVAILABLE ON THE NCEP AND NWS FTP SERVERS. THESE CHANGES WILL ALSO IMPACT THE PRODUCTS GENERATED AS PART OF THE NORTH AMERICAN ENSEMBLE FORECAST SYSTEM /NAEFS/.
THE MODEL CHANGES INCLUDE:-INCREASE RESOLUTION OF THE GEFS FROM T126 TO T190 /ROUGHLY 70 KM/ FOR ALL CYCLES OUT TO 16 DAYS
-INTRODUCE EARTH SYSTEM MODELING FRAMEWORK /ESMF/ V3.1.0RP2 TO GEFS-ADD STOCHASTIC PERTURBATION SCHEME TO ACCOUNT FOR RANDOM MODEL ERRORS
THE PRODUCT GENERATING PROCESS ID IN THE GRIB ENCODING OF THE GEFS AND NAEFS PRODUCTS AVAILABLE ON THE NCEP AND NWS FTP SERVERS WILL BE CHANGED FROM 80 TO 107 FOR THE GEFS PRODUCTS AND FROM 80 TO 114 FOR THE NAEFS PRODUCTS. FOR INFORMATION SEE /USE LOWERCASE/:
WWW.NCO.NCEP.NOAA.GOV/PMB/DOCS/ON388/TABLEA.HTML/THE GEFS PRODUCTS DISSEMINATED ON THE SBN/NOAAPORT WILL NOT BE AFFECTED BY THIS CHANGE. THIS CHANGE TO THE GRIB ENCODING MAY NECESSITATE THE MODIFICATION OF USER PROCESSES THAT DECODE THESE GEFS AND NAEFS GRIB FILES.
THREE NEW PARAMETERS WILL BE ADDED TO THE GEFS OUTPUT FILES AND 24 PARAMETERS WILL BE MOVED FROM THEIR CURRENT DIRECTORY LOCATIONS ON THE NCEP FTP SERVER TO NEW DIRECTORY LOCATIONS AS PART OF THE NAEFS DATA EXCHANGE BETWEEN THE NWS AND THE METEOROLOGICAL SERVICE OF CANADA /MSC/. THE FOLLOWING THREE NEW PARAMETERS WILL BE ADDED TO THE GEFS OUTPUT ON THE FTP SERVERS: 10HPA (MB) RELATIVE HUMIDITY
50HPA (MB) RELATIVE HUMIDITY SNOW DEPTHTHE FOLLOWING PARAMETERS CURRENTLY AVAILABLE IN THE PGRB2B AND PGRB2BLR DIRECTORIES ON THE NCEP FTP SERVER WILL NOW BE AVAILABLE IN THE PGRB2A AND PGRB2ALR DIRECTORIES. 10HPA (MB) GEOPOTENTIAL HEIGHT
10HPA (MB) TEMPERATURE 10HPA (MB) U COMPONENT OF WIND 10HPA (MB) V COMPONENT OF WIND 50HPA (MB) GEOPOTENTIAL HEIGHT 50HPA (MB) TEMPERATURE 50HPA (MB) U COMPONENT OF WIND 50HPA (MB) V COMPONENT OF WIND 100HPA (MB) GEOPOTENTIAL HEIGHT 100HPA (MB) TEMPERATURE 100HPA (MB) RELATIVE HUMIDITY 100HPA (MB) U COMPONENT OF WIND 100HPA (MB) V COMPONENT OF WIND 850HPA (MB) VERTICAL VELOCITYCONVECTIVE INHIBITION (CIN 180-0 HPA) LATENT HEAT NET FLUX
SENSIBLE HEAT NET FLUX DOWNWARD SHORTWAVE RADIATION FLUX AT SURFACE DOWNWARD LONGWAVE RADIATION FLUX AT SURFACE UPWARD SHARTWAVE RADIATION FLUX AT SURFACE UPWARD LONGWAVE EADIATION FLUX AT SURFACE UPWARD LONGWAVE RADIATION FLUX AT TOP OF ATMOSPHERE VOLUMETRIC SOIL MOISTURE (0-10CM) WATER EQUIVALENT OF ACCUMULATED SNOW DEPTH SOIL TEMPERATURE (0-10CM DOWN)DATA DELIVERY TIMING WILL NOT BE IMPACTED BY THIS IMPLEMENTATION. A SMALL INCREASE IN DATA VOLUMES IS EXPECTED. THESE CONTENT CHANGES WILL IMPACT THE NWS PUBLIC FTP SERVER AND THE NCEP PUBLIC FTP SERVER.
TEST DATA IS AVAILABLE AT /USE LOWERCASE/: FTP://FTP.EMC.NCEP.NOAA.GOV/GC_WMB/YZHU/GEFS_1Q2009/COM/GENS/PROD/ A CONSISTENT PARALLEL FEED OF DATA WILL BECOME AVAILABLE ON THE NCEP FTP SERVER ONCE THE MODEL IS RUNNING IN PARALLEL ON THE NCEP CENTRAL COMPUTING SYSTEM ON NOVEMBER 3 2009. AT THIS TIME THE PARALLEL DATA WILL BECOME AVAILABLE VIA THE FOLLOWING URL /USE LOWERCASE/:
FTP://FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GENS/PARASPECIFIC INFORMATION REGARDING THE DATA CHANGE CAN BE FOUND AT /USE LOWERCASE/:
WWWT.EMC.NCEP.NOAA.GOV/GMB/YZHU/IMP/I200811/DATA-EXCHANGE.PDF SPECIFIC INFORMATION REGARDING THE NAEFS AND SCIENTIFIC IMPLEMENTATION COULD BE FOUND AT /USE LOWERCASE/:
WWWT.EMC.NCEP.NOAA.GOV/GMB/YZHU/HTML/IMP/200811_IMP.HTML USERS SHOULD ENSURE THEIR DECODERS ARE FLEXIBLE AND ARE ABLE TO ADEQUATELY HANDLE CHANGES IN CONTENT ORDER...PARAMETER FIELDS CHANGING ORDER...CHANGES IN THE SCALING FACTOR COMPONENT WITHIN THE PDS OF THE GRIB FILES AND ALSO ANY VOLUME CHANGES WHICH MAY BE FORTHCOMING. THESE ELEMENTS MAY CHANGE WITH FUTURE NCEP MODEL IMPLEMENTATIONS. NCEP WILL MAKE EVERY ATTEMPT TO ALERT USERS TO THESE CHANGES PRIOR TO ANY IMPLEMENTATIONS.
FOR QUESTIONS REGARDING THESE MODEL CHANGES...CONTACT:
YUEJIAN ZHU
NCEP...GLOBAL MODELING BRANCH
CAMP SPRINGS MARYLAND
PHONE: 301-763-8000 X 7052
EMAIL: YUEJIAN.ZHU@xxxxxxxx
FOR QUESTIONS REGARDING THE DATAFLOW ASPECTS OF THESE DATA
SETS... PLEASE CONTACT:
REBECCA COSGROVE
NCEP/NCO DATAFLOW TEAM
CAMP SPRINGS MARYLAND 20746
PHONE: 301-763-8000 X 7198
EMAIL: NCEP.LIST.PMB-DATAFLOW@xxxxxxxx
NWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT
/USE LOWERCASE/:
HTTP://WWW.NWS.NOAA.GOV/OS/NOTIF.HTM
$$
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