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-------- Original Message --------931 NOUS41 KWBC 071253
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 07-33 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 853 AM EDT MON MAY 7 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: NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/
REAL TIME OCEAN FORECAST SYSTEM /RTOFS/ MODEL UPGRADE:
EFFECTIVE JUNE 5 2007
NOTE: NCEP COASTAL OCEAN FORECAST SYSTEM /COFS/ TO BE DISCONTINUED 90 DAYS AFTER THE IMPLEMENTATION OF THIS RTOFS UPDATE. SEE DETAILS BELOW.
EFFECTIVE TUESDAY JUNE 5 2007...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...NCEP WILL UPGRADE THE RTOFS FORECAST SYSTEM.
THIS UPGRADE IS EXPECTED TO IMPROVE THE RTOFS ANALYSIS AND FORECAST SKILL AS WELL AS EXTEND THE PRODUCTS SUITE FOR THE RTOFS ATLANTIC DOMAIN. DETAILS OF THESE CHANGES ARE AS FOLLOWS:ALGORITHM CHANGES: A. DATA ASSIMILATION
- FOR SEA SURFACE TEMPERATURE: CHANGES IN NUDGING PARAMETERS... REMOVAL OF BIAS FOR GOES SST OBSERVATIONS. - FOR SEA SURFACE HEIGHT: NEW ALGORITHMS TO ASSIMILATE SEA SURFACE HEIGHT ANOMALIES FROM JASON AND GFO. - FOR VERTICAL PROFILES OF TEMPERATURE AND SALINITY: NEW ALGORITHMS TO ASSIMILATE TEMPERATURE AND SALINITY PROFILES. B. HYCOM MODEL - REMOVE APPROXIMATION TO BOTTOM PRESSURE IN MONTGOMERY POTENTIAL CALCULATION. - IMPROVE STABILITY IN PRESSURE GRADIENT CALCULATIONS.- THE TWO INVARIANT EXTERNAL MODE BOUNDARY CONDITION IS BEING RE-DEPLOYED.
- FOR WATER FLUXES INTO THE OCEAN /RIVERS AND PRECIPITATION MINUS EVAPORATION/: THE WATER COLUMN MIGHT BE REFRESHED TO ARBITRARYDEPTH...AS NEEDED.
C. DATA INPUTS AND MODEL PARAMETERS - USE REVISED AND EXTENDED HYDROBASE CLIMATOLOGY NCEP VERSION 6.- NUMBER OF VERTICAL LEVELS INCREASED FROM 25 TO 26 WITH IMPROVED DENSITY TARGETS. - USE REVISED RIVER INFLOW DATA /LOCATION...STRENGTH/ FROM UNITED STATES GEOLOGICAL SURVEY RIVER OUTFLOW DATA IN REAL TIME. - REMOVE NOISE IN NET HEAT FLUX.
- IMPROVED VALUES OF TRANSPORT AND SURFACE ELEVATION USED AT OPEN BOUNDARIES. D. PRODUCTS - USE GRIB FILES ON NATIVE GRIDS. - USE REGIONAL GRIB FILES FOR GULF OF MEXICO NORTH-WEST ATLANTIC /2 SUB-REGIONS/ FOR EFFICIENT TRANSMISSION.NCEP CENTRAL OPERATIONS IS CURRENTLY RUNNING A PARALLEL REAL-TIME FORECAST EMPLOYING THESE UPGRADES. THE PRODUCTS FROM THIS PARALLEL FORECAST CAN BE FOUND AT /USE LOWER CASE LETTERS/:
FTP://FTPPRD.NCEP.NOAA.GOV/PUB/DATA2/COM/OFS/PARA/OFS.YYYYMMDDIN ADDITION TO THE ABOVE UPGRADE...THE AVAILABILITY OF THE NCEP COFS MODEL ON THE NCEP FTP SERVER WILL BE DISCONTINUED 90 DAYS AFTER THE IMPLEMENTATION OF THE RTOFS UPDATE. THE COFS DATA ARE CURRENTLY FOUND AT /USE LOWER CASE LETTERS/:
FTP://FTPPRD.NCEP.NOAA.GOV/PUB/DATA2/COM/COFS/PROD/COFS.YYYYMMDDSAMPLES OF NOWCAST AND FORECAST FIELDS... ADDITIONAL INFORMATION AND NOWCAST/FORECAST EVALUATIONS ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://POLAR.NCEP.NOAA.GOV/OFS
IF YOU HAVE ANY QUESTIONS ABOUT THIS CHANGE...PLEASE CONTACT:
VERA GERALD
NCEP...MARINE MODELING AND ANALYSIS BRANCH
CAMP SPRINGS MARYLAND
PHONE: 301 763 8000 X7213
EMAIL: VERA.GERALD@xxxxxxxx
THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/: HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM $$
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