NOUS41 KWBC 242007 PNSWSH SERVICE CHANGE NOTICE 09-15 NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 310 PM EST TUE FEB 24 2009 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 STORM SURGE INFORMATION IN TROPICAL CYCLONE PUBLIC ADVISORIES FROM THE NATIONAL HURRICANE CENTER: EFFECTIVE MAY 15 2009 REFERENCE: SERVICE CHANGE NOTICE 09-14 ISSUED FEB 24 2009 STARTING IN 2009...IN AN EFFORT TO ENSURE STORM SURGE FORECASTS ARE FULLY UNDERSTOOD BY THE WIDEST POSSIBLE AUDIENCE...THE NATIONAL HURRICANE CENTER /NHC/ WILL CHANGE THE WORDING IN THE PUBLIC ADVISORY TEXT PRODUCTS TO REFERENCE STORM SURGE OR STORM TIDE IN TERMS OF HEIGHT ABOVE GROUND LEVEL. STORM SURGE REFERS TO THE ABNORMAL RISE IN SEA LEVEL ACCOMPANYING A HURRICANE...THE DIFFERENCE BETWEEN THE OBSERVED LEVEL OF THE SEA SURFACE AND THE LEVEL THAT WOULD HAVE OCCURRED IN THE ABSENCE OF THE CYCLONE. STORM TIDE IS THE ACTUAL LEVEL OF SEA WATER RESULTING FROM THE ASTRONOMIC TIDE COMBINED WITH THE STORM SURGE. STORM TIDE IS OF PARTICULAR IMPORTANCE IN THE NORTHERN LATITUDES...WHERE THERE IS A GREATER DIFFERENCE IN HEIGHTS BETWEEN HIGH AND LOW TIDE LEVELS...AND WHEN A STORM IS EXPECTED TO LANDFALL NEAR THE TIMES OF ASTRONOMICAL HIGH TIDE. BEGINNNING IN 2009...NHC PUBLIC ADVISORY PRODUCTS /TCP/S WILL PROVIDE THE FOLLOWING POSSIBLE STATEMENTS ON COASTAL FLOODING ASSOCIATED WITH TROPICAL CYCLONES: EXAMPLE 1 STORM SURGE WILL RAISE WATER LEVELS BY AS MUCH AS NN /FOR EXAMPLE 15/ FEET ABOVE GROUND LEVEL ALONG THE COAST...WITH LARGE AND DANGEROUS BATTERING WAVES...NEAR AND TO THE ZZZZ /DIRECTION FOR EXAMPLE EAST/ OF WHERE THE CENTER MAKES LANDFALL. THE SURGE COULD PENETRATE AS FAR INLAND AS ABOUT NN /FOR EXAMPLE 30/ MILES FROM THE SHORE WITH DEPTH GENERALLY DECREASING AS THE WATER MOVES INLAND. EXAMPLE 2 STORM TIDE WILL RAISE WATER LEVELS BY AS MUCH AS NN /FOR EXAMPLE 18/ FEET ABOVE GROUND LEVEL ALONG THE COAST...WITH LARGE AND DANGEROUS BATTERING WAVES...NEAR AND TO THE ZZZZ /DIRECTION FOR EXAMPLE EAST/ OF WHERE THE CENTER MAKES LANDFALL. STORM TIDE COULD PENETRATE AS FAR INLAND AS ABOUT NN /FOR EXAMPLE 30/ MILES FROM THE SHORE WITH DEPTH GENERALLY DECREASING AS THE WATER MOVES INLAND. PLEASE SEE SERVICE CHANGE NOTICE 09-14...ISSUED ON FEB 24 2009...FOR FORMAT CHANGES TO TROPICAL CYCLONE PUBLIC ADVISORY PRODUCTS FOR THE ATLANTIC...EAST PACIFIC...AND CENTRAL PACIFIC HURRICANE BASINS: EFFECTIVE MAY 15 2009. AN EXAMPLE OF THE TCP PRODUCT FOR 2009 IS PROVIDED ONLINE AT /USE LOWER CASE LETTERS/: HTTP://WWW.NHC.NOAA.GOV/TCP_EXAMPLE.SHTML THE NHC IS RESPONSIBLE FOR ALL METEOROLOGICAL DECISIONS CONCERNING FORECASTING OF TROPICAL AND SUBTROPICAL SYSTEMS FOR THE ATLANTIC OCEAN AND THE EASTERN PACIFIC OCEAN...NORTH OF THE EQUATOR AND EAST OF 140 DEGREES WEST LONGITUDE. IF YOU HAVE QUESTIONS...PLEASE CONTACT: TIMOTHY SCHOTT NATIONAL WEATHER SERVICE MARINE AND COASTAL SERVICES BRANCH 1325 EAST WEST HWY ROOM 13124 SILVER SPRING MARYLAND 20910 PHONE: 301-713-1677 EXTENSION 122 THIS AND OTHER SERVICE CHANGE NOTICES CAN BE FOUND ONLINE AT /USE LOWER CASE LETTERS/: HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM $$ NNNN
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