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088 NOUS41 KWBC 271802 PNSWSH TECHNICAL IMPLEMENTATION NOTICE 05-33 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 200 PM EDT WED APR 27 2005 TO: 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 OF THE NCEP GLOBAL FORECAST SYSTEM EFFECTIVE: MAY 31 2005 EFFECTIVE MAY 31 2005...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL UPGRADE THE GLOBAL FORECAST SYSTEM /GFS/ TO IMPROVE ITS ACCURACY AND PRODUCTS. THIS UPGRADE INVOLVES INCREMENTAL IMPROVEMENTS TO THE ANALYSIS AND FORECAST OF THE GFS. DETAILS OF THESE CHANGES INCLUDE: ANALYSIS CHANGES: - INCREASE HORIZONTAL RESOLUTION TO T382. - ASSIMILATE AQUA AIRS AND AMSU-A BRIGHTNESS TEMPERATURES. - MODIFY THINNING ALGORITHM FOR BRIGHTNESS TEMPERATURES. - ADD SURFACE MICROWAVE EMISSIVITY MODEL OVER SNOW AND ICE. - MODIFY BRIGHTNESS TEMPERATURE QUALITY CONTROL ALGORITHM TO CHECK FOR THE PRESENCE OF CLOUDS IN IR FIELDS OF VIEW. FORECAST MODEL CHANGES: - HORIZONTAL RESOLUTION INCREASED FROM T254 (~55 KM) 64 LAYERS TO T382 (~35KM) 64 LAYERS FOR FORECAST HOURS 0-180. - HORIZONTAL RESOLUTION INCREASED FROM T126 (~100 KM) 42 LAYERS TO T190 (~70 KM) 64 LAYERS FOR FORECAST HOURS GREATER THAN 180. - ADDITION OF THE NOAH LAND SURFACE MODEL WITH 4 SOIL LAYERS. - NEW SEA ICE MODEL. - REDUCED VERTICAL DIFFUSION. - ENHANCED MOUNTAIN BLOCKING. THIS UPGRADE WILL NOT CHANGE GFS PRODUCTS SENT OVER NOAAPORT. NCEP CENTRAL OPERATIONS IS CURRENTLY RUNNING A REAL-TIME PARALLEL RUN OF THE T382 GFS. RESULTS FROM THESE PARALLEL RUNS CAN BE VIEWED AT /USE LOWER CASE LETTERS/: HTTP://WWW.NCO.NCEP.NOAA.GOV/PMB/NWPARA/ANALYSIS/ FOR QUESTIONS CONCERNING THESE CHANGES...PLEASE CONTACT: DR. MARK IREDELL NCEP...GLOBAL MODELING BRANCH CAMP SPRINGS MARYLAND PHONE: 301 763 8000 X7231 EMAIL: MARK.IREDELL@xxxxxxxx OR KEN CAMPANA NCEP...GLOBAL MODELING BRANCH CAMP SPRINGS MARYLAND PHONE: 301 763 8000 X7228 EMAIL: KENNETH.CAMPANA@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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