NOUS41 KWBC 231211 PNSWSH TECHNICAL IMPLEMENTATION NOTICE 06-71 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 810 AM EDT MON OCT 23 2006 TO: FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER WIRE SERVICE /NWWS/ SUBSCRIBERS... EMERGENCY MANAGERS WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS...NOAAPORT SUBSCRIBERS... OTHER NATIONAL WEATHER SERVICE /NWS/ CUSTOMERS AND PARTNERS... AND NWS EMPLOYEES FROM: THERESE Z. PIERCE CHIEF...MARINE AND COASTAL SERVICES BRANCH SUBJECT: CHANGES TO TROPICAL CYCLONE PROBABILISTIC WIND SPEED PRODUCTS: EFFECTIVE JANUARY 18 2007 EFFECTIVE JANUARY 18 2007 AT 0300 COORDINATED UNIVERSAL TIME /UTC/...THE TEMPORAL RESOLUTION OF TROPICAL CYCLONE PROBABILISTIC WIND SPEED FORECASTS WILL CHANGE FROM 12 HOURS TO 6 HOURS. CURRENTLY NWS ROUTINELY DISSEMINATES TROPICAL CYCLONE PROBABILISTIC WIND SPEED FORECASTS WHEN TROPICAL CYCLONES ARE FORECAST FOR THE ATLANTIC...THE EASTERN PACIFIC...CENTRAL PACIFIC...AND WESTERN PACIFIC HURRICANE BASINS. THESE PRODUCTS ARE DISSEMINATED FOUR TIMES PER DAY WHEN TROPICAL CYCLONE ADVISORIES ARE ISSUED: 0300...0900...1500...AND 2100 UTC...AND IN CONJUNCTION WITH THE ISSUANCE OF SPECIAL TROPICAL CYCLONE ADVISORIES. THESE PRODUCTS CURRENTLY PROVIDE THE PROBABILITIES OF SUSTAINED WIND SPEED EXCEEDANCE FOR THREE THRESHOLDS: 34 KNOTS ...50 KNOTS...AND 64 KNOTS...AT 12 HOURLY FORECAST INTERVALS OUT TO 120 HOURS. THE PRODUCTS ARE ISSUED ON AWIPS GRID 231 IN GRIDDED BINARY /GRIB2/ FORMAT AT A 0.5 DEGREE KILOMETER RESOLUTION. THE WMO HEADERS AND ASSOCIATED FORECAST INTERVALS FOR THE EXISTING PRODUCTS ARE AS FOLLOWS: LDGA98 KNHC 0 HOUR LDGC98 KNHC 12 HOUR LDGE98 KNHC 24 HOUR LDGG98 KNHC 36 HOUR LDGI98 KNHC 48 HOUR LDGJ98 KNHC 60 HOUR LDGK98 KNHC 72 HOUR LDGL98 KNHC 84 HOUR LDGM98 KNHC 96 HOUR LDGN98 KNHC 108 HOUR LDGO98 KNHC 120 HOUR ON JANUARY 18 2007 AT 0300 UTC...THE TEMPORAL RESOLUTION OF THESE FORECAST PRODUCTS WILL CHANGE FROM 12 HOURS TO 6 HOURS. THE WMO HEADERS AND THE ASSOCIATED FORECAST INTERVALS FOR THE NEW SIX HOURLY PRODUCTS ARE LISTED BELOW. USERS WISHING TO RECEIVE THE NEW SIX HOURLY FORECAST PRODUCTS MUST MAKE THE FOLLOWING CHANGES TO THEIR DATABASES. WMO HEADER FORECAST INTERVAL ACTION LDGB98 KNHC 6 HOURS ADD LDGD98 KNHC 18 HOURS ADD LDGF98 KHHC 30 HOURS ADD LDGH98 KNHC 42 HOURS ADD MDGM98 KNHC 54 HOURS ADD MDGN98 KNHC 66 HOURS ADD MDGT98 KNHC 78 HOURS ADD MDGU98 KNHC 90 HOURS ADD MDGV98 KNHC 102 HOURS ADD MDGW98 KNHC 116 HOURS ADD IF YOU HAVE QUESTIONS REGARDING THIS NOTICE...PLEASE CONTACT: TIMOTHY SCHOTT NATIONAL WEATHER SERVICE MARINE AND COASTAL SERVICES BRANCH 1325 EAST WEST HIGHWAY SILVER SPRING MARYLAND 20910 EMAIL: TIMOTHY.SCHOTT@NOAA.GOV THIS AND ALL OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE AT /USE LOWER CASE LETTERS/: HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM $$ NNNN
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