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-------- Original Message --------758 NOUS41 KWBC 221224
PNSWSH TECHNICAL IMPLEMENTATION NOTICE 07-33...AMENDED NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 830 AM EDT FRI JUN 22 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: AMENDED: NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION
/NCEP/ REAL TIME OCEAN FORECAST SYSTEM /RTOFS/ MODEL
UPGRADE: EFFECTIVE JUNE 5 2007
REFER TO: TECHNICAL IMPLEMENTATION NOTICE 07-43 AMENDED TO REMOVE REFERENCE TO PARALLEL DATA SETS AND TO PROVIDE A VALID FTP SERVER LINK FOR CURRENT OPERATIONAL RTOFS MODEL DATA.
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 ARBITRARY DEPTH...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.OPERATIONAL RTOFS MODEL DATA OUTPUT CAN BE FOUND AT THE FOLLOWING LINK /USE LOWER CASE LETTERS/:
FTP://FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/OFS/PROD/OFS.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 $$ NNNN
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