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912
NOUS41 KWBC 292026
PNSWSH
PUBLIC INFO. STATEMENT ... TECHNICAL INFORMATION NOTICE 01-05
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
330 PM EST MON JAN 29 2001
TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER
WIRE SERVICE /NWWS/ SUBSCRIBERS...OTHER NATIONAL
WEATHER SERVICE /NWS/ CUSTOMERS...NWS EMPLOYEES
FROM: ROBERT LANDIS...CHIEF
METEOLORIGCAL SERVICES DIVISION
SUBJECT: CRISIS IMPLEMENTATION OF NEW SEA SURFACE TEMPERATURE
SCHEME IN THE NATIONAL CENTERS FOR ENVIRONMENTAL
PREDICTION /NCEP/ OPERATIONAL MESO ETA MODEL
SYSTEM...EFFECTIVE JANUARY 30 2001 AT 1200 UTC
...THE FOLLOWING CHANGES HAVE NO IMPACT ON NOAA WEATHER WIRE
SERVICE SUBSCRIBERS...
AT 1200 UTC ON JANUARY 30 2001...A NEW SEA SURFACE TEMPERATURE
/SST/ ANALYSIS WILL BE IMPLEMENTED IN THE OPERATIONAL MESO ETA
MODEL FORECAST SYSTEM.
BRIEF DESCRIPTION OF CHANGE:
THIS CHANGE WILL REPLACE THE USE OF THE 1 DEGREE BY 1 DEGREE
REYNOLDS OPTIMUM INTERPOLATION /OI/ ANALYSIS OF SEA-SURFACE
TEMPERATURE /SST/ IN THE MESO ETA MODEL RUNS WITH A NEW SST
ANALYSIS. THE OCEAN MODELING BRANCH OF THE ENVIRONMENTAL
MODELING CENTER /EMC/ HAS DESIGNATED THIS THE REAL TIME GLOBAL
SST /RTG_SST/...WHICH IS PERFORMED ON A 50 KM GRID.
REASON FOR CHANGE:
THIS NEW SST ANALYSIS IS A MAJOR IMPROVEMENT OVER THE CURRENT
OPERATIONAL SST ANALYSIS PRODUCTS...NCEP'S REYNOLDS OI ANALYSIS
AND THE NATIONAL ENVIRONMENTAL SATELLITE DATA AND INFORMATION
SERVICE /NESDIS/ MCSST. THE NEW ANALYSIS INCLUDES BOTH IN-SITU
SHIP AND BUOY OBSERVATIONS AND HIGH-RESOLUTION /4 KM/ SATELLITE
SST RETRIEVALS. THESE DATA ARE ALSO USED IN THE REYNOLDS OI...
HOWEVER IT USES 7-DAYS OF DATA MADE INTO 1 DEGREE SUPER-OBS
RESULTING IN A VERY SMOOTH ANALYSIS. THE NESDIS ANALYSIS PRODUCT
IS AT 50 KM...DOES A GOOD JOB ON THE GULF STREAM BUT USES THE
SATELLITE RETRIEVALS ONLY. THE RTG_SST ANALYSIS USES THE MOST
RECENT 24 HOURS OF DATA /HENCE REAL-TIME/...IS PERFORMED ON A
HIGHER-RESOLUTION /HALF DEGREE/ GRID THAN THE REYNOLDS AND
PRODUCES A SHARPER DEPICTION OF THE WARM CORE OF THE GULF STREAM
AND ASSOCIATED GRADIENTS. IT ALSO IS THE ONLY ANALYSIS TO
PROPERLY DEPICT THE COLDER SHELF WATER - A FEATURE THAT WAS
FOUND DURING RERUNS OF THE MESO ETA TO BE CRITICAL IN GETTING
AN ACCURATE MODEL PREDICTION FOR THE RECENT DECEMBER 30 2000 EAST
COAST WINTER STORM.
TESTING AND EVALUATION:
THE NEW SST SCHEME HAS BEEN RUN IN PARALLEL TO THE CURRENT
OPERATIONAL SCHEME SINCE DECEMBER 28 2000... AND WAS EVALUATED BY
NCEP/S HYDROMETEOROLOGICAL PREDICTION CENTER /HPC/ AND MARINE
PREDICTION CENTER /MPC/. THE NEW SCHEME WAS ALSO TESTED BY
EMC/S OCEAN MODELING BRANCH FOR A 12 MONTH PERIOD.
NO CHANGES TO ANY OF THE STANDARD ETA MODEL GRIDS OR PRODUCTS
AVAILABLE FROM THE FAMILY OF SERVICES ... THE AWIPS SATELLITE
BROADCAST NETWORK...OR FROM THE OSO SERVER WILL BE MADE WITH
THIS IMPLEMENTATION.
THIS CHANGE WAS APPROVED AT THE JANUARY 24 2001 MEETING OF THE
COMMITTEE ON APPLIED FORECASTING TECHNIQUES AND IMPLEMENTATION.
A COPY OF THE PRESENTATION MADE AT THAT MEETING IS AVAILABLE
ONLINE AT /USE LOWER CASE/:
FTP://FTP.NCEP.NOAA.GOV/PUB/EMC/WD20ER/CAFTINFO/SLD001.HTM
IF YOU HAVE ANY QUESTIONS ABOUT THESE CHANGES TO THE ETA
MODEL...PLEASE CONTACT:
GEOFF DIMEGO
PHONE: 301-763-8000 EXT. 7221
E-MAIL: GDIMEGO@xxxxxxxxxxxxx
THIS AND OTHER NATIONAL TECHNICAL INFORMATION NOTICES ARE
AVAILABLE ON THE INTERNET AT /USE LOWER CASE/
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
END
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