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-------- Original Message --------108 NOUS41 KWBC 291119
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 10-17 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 720 AM EDT THU APR 27 2010 TO: SUBSCRIBERS:-FAMILY OF SERVICES -NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS...USERS AND EMPLOYEES
FROM: TIMOTHY MCCLUNG
SCIENCE PLANS BRANCH CHIEF
OFFICE OF SCIENCE AND TECHNOLOGY
SUBJECT: HURRICANE WEATHER AND RESEARCH FORECAST MODEL
CHANGES: EFFECTIVE JUNE 1 2010
EFFECTIVE TUESDAY JUNE 1 2010...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL UPGRADE THE HURRICANE WEATHER AND RESEARCH FORECAST /HWRF/--PRINCETON OCEAN MODEL /POM/ COUPLED SYSTEM. THE SCIENTIFIC ENHANCEMENTS INCLUDE THE FOLLOWING:
-CODE CORRECTIONS FOR LAND SURFACE TEMPERATURE...RADIATION... AND ADVECTION OF VERTICAL VELOCITY
-ASSIMILATION OF AMSU...AQUA AND GOES SATELLITE RADIANCE DATA IN THE 9KM INNER NEST -MORE REALISTIC SPECIFICATION OF SURFACE HEAT AND MOMENTUM EXCHANGE COEFFICIENTS USED IN OCEANIC FLUX CALCULATION -ADDITION OF GRAVITY WAVE DRAG PARAMETERIZATIONTEST RESULTS FROM THE COMBINATION OF THESE UPGRADES SHOWED IMPROVED TRACK AND INTENSITY FORECAST SKILL AND REDUCED INTENSITY BIAS FOR BOTH ATLANTIC AND EASTERN NORTH PACIFIC BASINS.
IN ADDITION THE FOLLOWING ELEMENTS WILL BE ADDED TO THE HWRF MODEL
OUTPUT GRIB FILES:-SIMULATED GOES SATELLITE IMAGERY PRODUCTS /INFRARED AND WATER VAPOR CHANNELS/ -SIMULATED RADAR REFLECTIVITY -TEMPERATURE AT 2M
-DEWPOINT TEMPERATURE AT 2M AND OTHER PRESSURE LEVELSTHE FOLLOWING ELEMENTS WILL BE ADDED TO THE POM OCEAN MODEL OUTPUT FILES: -MIXED LAYER DEPTH -OCEANIC HEAT CONTENT THE HWRF GRIB PRODUCTS ARE DISSEMINATED VIA THE NCEP FTP SERVER. THESE CHANGES WILL RESULT IN NO CHANGE IN PRODUCT DISSEMINATION TIME. THERE WILL BE AN INCREASE OF ROUGHLY 2GB IN PRODUCT SIZE DUE TO THE ADDITIONAL ELEMENTS. THESE CHANGES WILL NOT IMPACT NOAAPORT OR AWIPS.
MORE DETAILS ABOUT THE HWRF-POM ARE AVAILABLE AT /USE LOWERCASE EXCEPT FOR HWRF/:
HTTP://WWW.EMC.NCEP.NOAA.GOV/HWRF/INDEX.HTMLNCEP ENCOURAGES USERS TO ENSURE THEIR DECODERS ARE FLEXIBLE AND ARE ABLE TO ADEQUATELY HANDLE CHANGES IN CONTENT... PARAMETER FIELDS CHANGING ORDER...CHANGES IN THE SCALING FACTOR COMPONENT WITHIN THE PRODUCT DESCRIPTION SECTION /PDS/ OF THE GRIB FILES AND ANY VOLUME CHANGES WHICH MAY OCCUR. 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...PLEASE CONTACT:
DR. VIJAY TALLAPRAGADA NCEP/ENVIRONMENTAL MODELING CENTER HURRICANE FORECAST PROJECT CAMP SPRINGS MARYLAND 301-763-8000 X7232 VIJAY.TALLAPRAGADA@xxxxxxxxNWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT /USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM $$ NNNN
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