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-------- Original Message --------091 NOUS41 KWBC 201323
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 06-44 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 922 AM EDT TUE JUN 20 2006TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER WIRE SERVICE /NWWS/ SUBSCRIBERS... EMERGENCY MANAGERS WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS... NOAAPORT SUBSCRIBERS... OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS AND PARTNERS...NWS EMPLOYEES
FROM:PAUL HIRSCHBERG CHIEF...SCIENCE PLANS BRANCH OFFICE OF SCIENCE AND TECHNOLOGY /OST/SUBJECT:UPGRADES TO THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION GLOBAL FORECAST SYSTEM...EFFECTIVE JULY 25 2006
EFFECTIVE JULY 25 2006...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL IMPLEMENT UPGRADES TO ITS GLOBAL FORECAST SYSTEM /GFS/ MODEL. THESE UPGRADES ARE AS FOLLOWS:
- BEGIN USE OF THE HYBRID /SIGMA-PRESSURE/ VERTICAL COORDINATE SYSTEM /SPECTRAL STATISTICAL INTERPOLATION ANALYSIS REMAINS IN SIGMA COORDINATE/
- ADDITION OF NAVAL RESEARCH LABORATORY /NRL/ OZONE PHYSICS - ADDITION OF GLACIAL ICE PHYSICS WITH MODIFIED OROGRAPHY - IMPROVED GLOBAL SNOW ANALYSIS /LESS INTERPOLATION/ - CORRECTION TO SURFACE DOWNWARD LONGWAVE RADIATION - CHANGE OF THE TIME-FILTER COEFFICIENT /0.85/ - UPGRADES TO SURFACE CYCLING...COMPATIBLE WITH THE NEW SNOW ANALYSIS - USES EARTH SYSTEM MODELING FRAMEWORK/ESMF/ SUPERSTRUCTURE - RESTART FILES ARE IN FULL PRECISION /FORECASTS ARE THUS REPRODUCIBLE/ - WILL ALLOW MULTIPLE ENSEMBLE MEMBER FORECASTS TO BE RUN CONCURRENTLY THE PURPOSE OF THESE CHANGES IS TO: - TAKE ADVANTAGE OF THE HYBRID VERTICAL COORDINATE - USE ESMF - MAKE MINOR IMPROVEMENTS /TIME FILTER COEFFICIENT AND DOWNWARD LONGWAVE RADIATION/ - MAKE UPGRADES THAT HAVE BEEN PLANNED FOR AWHILE /NEW SNOW ANALYSIS/ - MAKE PHYSICS CHANGES /OZONE AND GLACIAL ICE/THE EXPECTED IMPACTS ARE GENERALLY MINOR...THOUGH UV FORECASTS ARE EXPECTED TO BE IMPROVED BY THE CHANGED OZONE SCHEME.
THE NCEP ENVIRONMENTAL MODELING CENTER /EMC/ BEGAN RUNNING PARALLEL FORECASTS ON MAY 9 2006...AND IS CURRENTLY UP TO REAL- TIME. STATISTICAL SCORE COMPARISONS FOR BOTH THE OPERATIONAL AND NEW GFS ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.EMC.NCEP.NOAA.GOV/GC_WMB/WD20XW/HTML_DIE/INDEX_PRYO_NEW.HTML HTTP://WWW.EMC.NCEP.NOAA.GOV/GC_WMB/WD20XW/HTML_LINE/INDEX_PRYO_NEW.HTMLIF YOU HAVE ANY QUESTIONS CONCERNING THESE CHANGES...PLEASE CONTACT:
MARK IREDELL NCEP...GLOBAL MODELING BRANCH CAMP SPRINGS MARYLAND PHONE: 301 763 8000 X7231 EMAIL: MARK.IREDELL@xxxxxxxx OR BRENT GORDON NCEP...PRODUCTION MANAGEMENT BRANCH CAMP SPRINGS MARYLAND PHONE: 301 763 8000 X7193 EMAIL: BRENT.GORDON@xxxxxxxxTHIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM $$ -- Linda Miller - lmiller@xxxxxxxxxxxxxxxx Community Services, Unidata University Corporation for Atmospheric Research P.O. Box 3000 Boulder, CO 80307-3000303-497-8646 fax: 303-497-8690
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