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-------- Original Message --------121 NOUS41 KWBC 021836
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 07-51 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 236 PM EDT THU AUG 30 2007TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS
WEATHER INFORMATION NETWORK /EMWIN/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: UPGRADE TO NOAA WAVE WATCH III MODEL: EFFECTIVE
SEPTEMBER 18 2007
EFFECTIVE TUESDAY SEPTEMBER 18 2007...WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL UPGRADE THE NOAA WAVE WATCH III /NWW3/ MODEL. THE FOLLOWING CHANGES WILL BE INCORPORATED INTO THE NWW3 MODEL SYSTEM: 1. A MULTI-GRID GLOBAL MODEL THAT PROVIDES FORECAST PRODUCTS ON SEVERAL DIFFERENT GRIDS. ALL THE GRIDS HAVE INTERNAL TWO-WAY COUPLING AND EXCHANGE INFORMATION DURING THE COMPUTATION CYCLE. THE NEW GRIDS ARE: A. A 30 MINUTE RESOLUTION GLOBAL GRID. B. THREE 10 MINUTE RESOLUTION REGIONAL GRIDS COVERING THE UNITED STATES /US/ EAST/WEST COASTS AND EASTERN PACIFIC ISLANDS INCLUDING HAWAII. C. AN ALASKA REGIONAL GRID WITH A 15 MINUTE RESOLUTION IN LONGITUDE AND A 10 MINUTE RESOLUTION IN LATITUDE. D. TWO 4 MINUTE RESOLUTION COASTAL GRIDS FOR THE US EAST/WEST COASTS. THE US WEST COAST GRID ALSO INCLUDES THE COASTAL WATERS OF THE HAWAIIAN ISLANDS. E. AN ALASKAN COASTAL GRID WITH A RESOLUTION OF 8 MINUTES IN LONGITUDE AND 4 MINUTES IN LATITUDE. 2. FIELD OUTPUT WILL BE AVAILABLE IN GRIB2 FORMAT. 3. THE ENERGY SPECTRUM WILL BE PROPERLY PARTITIONED. THE FOLLOWING ADDITIONAL OUTPUT GRIDS WILL BE AVAILABLE:
A. PARTITIONED WAVE HEIGHT DATA FOR WIND SEAS-KPDS ID=102 PRIMARY SWELLS-KPDS ID=105-LEVEL 1
SECONDARY SWELLS-KPDS ID=105-LEVEL 2
B. PARTITIONED PEAK PERIOD DATA FOR WIND SEAS-KPDS
ID=103 PRIMARY SWELLS-KPDS ID=106-LEVEL 1
SECONDARY SWELLS-KPDS ID=106-LEVEL 2
C. PARTITIONED MEAN DIRECTION FOR WIND SEAS-KPDS ID=101
PRIMARY SWELLS-KPDS ID=104-LEVEL 1
SECONDARY SWELLS-KPDS ID=104-LEVEL 2
4. MINOR CHANGES TO THE PHYSICS INCLUDING:
A. LINEAR WAVE GROWTH TERM TO IMPROVE INITIAL WAVE
GROWTH RESULTS
B. A SURF ZONE BREAKING TERM TO PROVIDE MORE REALISTIC
ESTIMATES OF WAVE HEIGHT FOR LAND FALLING TROPICAL
SYSTEMS.
5. THE FORECAST RUN WILL NOW START 9 FORECAST HOURS PRIOR
TO THE ORIGINATING TIME OF THE CYCLE AS OPPOSED TO 6
HOURS PRIOR ALLOWING FOR 3 ADDITIONAL HOURS OF
ASSIMILATION. FORECAST OUTPUT CONTINUES OUT TO 180
HOURS.
THIS UPGRADED FORECAST SYSTEM WILL BE USED TO REPLACE THE CURRENT
GRIDDED OUTPUT OF THE NOAA WAVEWATCH III MODELING SYSTEM. THE
FOLLOWING GRIDS...WHICH ARE AVAILABLE ON NOAAPORT...WILL BE
IMPACTED BY THE UPGRADE MODELING SYSTEM:
EASTERN NORTH PACIFIC /ENP/ WESTERN NORTH ATLANTIC /WNA/ALASKAN WATERS /AKW/ THE PRODUCTS/GRIDS WHICH ARE DISSEMINATED TO NOAAPORT AND/OR THE SATELLITE BROADCAST NETWORK /SBN/ WILL NOT BE CHANGED IN VOLUME OR CONTENT.
IF YOU HAVE ANY QUESTIONS CONCERNING THESE CHANGES...PLEASE CONTACT:
HENDRIK TOLMAN NCEP/EMC...CHIEF MARINE MODELING BRANCH CAMP SPRINGS MARYLAND PHONE: 301 763 8000 X7253 EMAIL: HENDRIK.TOLMAN@xxxxxxxxTHIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
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