NOUS41 KWBC 161219 PNSWSH TECHNICAL IMPLEMENTATION NOTICE 07-22 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 817 AM EDT MON APR 16 2007 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 MAY 15 2007 REF: TIN 06-71 ANNOUNCING CHANGES TO THE TROPICAL CYCLONE PROBABILISTIC WIND SPEED PRODUCTS: TRANSMITTED OCTOBER 23 2006 BEGINNING MAY 15 2007 THE NATIONAL HURRICANE CENTER /NHC/ WILL HAVE THE CAPABILITY TO ISSUE TROPICAL CYCLONE INCREMENTAL PROBABILISTIC WIND SPEED FORECASTS. CURRENTLY THE NHC DISSEMINATES TROPICAL CYCLONE CUMULATIVE 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 AT 0300...0900...1500...AND 2100 COORDINATED UNIVERSAL TIME /UTC/...AND ALSO IN CONJUNCTION WITH THE ISSUANCE OF SPECIAL TROPICAL CYCLONE ADVISORIES. THESE PRODUCTS PROVIDE THE PROBABILITIES OF SUSTAINED WIND SPEED EXCEEDANCE FOR THREE THRESHOLDS: 34 KNOTS...50 KNOTS AND 64 KNOTS...AT 6 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. FOR ADDITIONAL DETAILS ON THE PROBABILISTIC WINDS PRODUCTS...TO INCLUDE DEFINITIONS OF THE CUMULATIVE AND INCREMENTAL PROBABILITIES...REFER TO THE NHC WEB SITE AT /USE LOWER CASE LETTERS/: HTTP://WWW.NHC.NOAA.GOV/ABOUTNHCPROD.SHTML THE INCREMENTAL DATA WILL BE ISSUED UNDER THE SAME HEADERS AS THE CUMULATIVE DATA. THERE ARE NO CHANGES TO THE COMMUNICATION HEADERS....REFERENCE TIN 06-71 TRANSMITTED ON OCTOBER 23 2006. THE GRIB FIELD DESCRIPTORS FOR THE INCREMENTAL DATA ARE DIFFERENT FROM THE CUMULATIVE DATA FIELD DESCRIPTORS. IF YOU HAVE QUESTIONS REGARDING THIS NOTICE...PLEASE CONTACT: SCOTT KISER NATIONAL WEATHER SERVICE MARINE AND COASTAL SERVICES BRANCH 1325 EAST WEST HIGHWAY SILVER SPRING MARYLAND 20910 EMAIL: SCOTT.KISER@NOAA.GOV THIS AND ALL OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE POSTED AT /USE LOWER CASE LETTERS/: HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM $$ NNNN
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