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506 NOXX10 KWBC 061601 DATA MGT 11-02.01 NDBC BUOYS TO BEGIN REPORTING SWELLS ON OR ABOUT DECEMBER 3 THE MOORED BUOYS OPERATED BY THE NATIONAL DATA BUOY CENTER /NDBC/ WILL BEGIN TO REPORT SWELL AND WIND-WAVE HEIGHTS AND PERIODS IN THE FM 13-XI SHIP CODED MESSAGES. SELECT COASTAL-MARINE AUTOMATED NETWORK /C-MAN/ STATIONS THAT MEASURE WAVES WILL ALSO REPORT THIS NEW INFORMATION. SELECT BUOYS WITH DIRECTIONAL WAVE MEASURING CAPABILITY WILL ALSO REPORT SWELL DIRECTION. THE NEW INFORMATION WILL BE ENCODED USING THE EXISTING 2 3 AND 4 GROUPS IN THE OCEANOGRAPHIC 222 SECTION OF FM 13 JUST LIKE SHIP REPORTS. THE METHOD USED TO ESTIMATE THE SWELLS AND WIND IS GIVEN ON HTTP /COLUN/ //WWW.NDBC.NOAA.GOV/WINDSEA.SHTML . BECAUSE WIND SPEED IS NEEDED TO PRODUCE THESE ESTIMATES NO SWELL OR WIND-WAVE INFORMATION WILL BE REPORTED IF THE WIND MEASURING SYSTEM HAS FAILED. SECONDARY SWELL INFORMATION WILL NOT BE REPORTED. FORECASTERS CAN SOMETIMES DETERMINE THESE SWELLS BY EXAMINING THE SPECTRAL WAVE INFORMATION TRANSMITTED IN THE FM 65-XI WAVEOB MESSAGES. USERS WILL SEE MINOR DIFFERENCES IN THE SWELL AND WIND-WAVE HEIGHTS REPORTED IN THE MESSAGES AND NDBC S WEB SITE HTTP /COLUN/ //WWW.NDBC.NOAA.GOV. THESE DIFFERENCES ARISE FROM TWO SOURCES. FIRST THE FM-13 ENCODING SCHEME REQUIRES ROUNDING THE HEIGHTS TO THE NEAREST HALF-METER. SECOND NDBC S WEB SITE BASES THE ESTIMATES ON SPECTRAL WAVE DATA THAT HAS BEEN ROUNDED AS IT WAS ENCODED INTO FM-65. FOR MORE INFORMATION CONTACT DAVE GILHOUSEN AT NDBC DAVE.GILHOUSEN /AT SYMBOL/ NOAA.GOV . FOR FOS/NOAAPORT FOR FOS/NOAAPORT AND NON-AWIPS CUSTOMERS. IF YOU HAVE ANY QUESTIONS REGARDING ROUTING OR WOULD LIKE TO ADD THESE PRODUCTS TO YOUR DATASTREAM PLEASE CONTACT. DATA MANAGEMENT EMAIL NWS.DM/AT SYMBOL/NOAA.GOV THIS INFORMATION IS ALSO POSTED ON THE NWS DATA MANAGEMENT CHANGE NOTICES WEB PAGE. THE URL IS LISTED BELOW. HTTP /COLON/ //WWW.NWS.NOAA.GOV/DATAMGMT/INDEX.HTML DATA MANAGEMENT TELECOMMUNICATION OPERATIONS CENTER RTH WASHINGTON SENDS ---------- End Forwarded Message ----------
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