-------- 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 PARAMETERIZATION
TEST 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 LEVELS
THE 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.HTML
NCEP 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@xxxxxxxx
NWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT
/USE LOWERCASE/:
HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM
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