000 AGXX40 KNHC 210642 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 242 AM EDT TUE SEP 21 2010 MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA AND TROPICAL N ATLC...AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO... A TROUGH WILL LINGER IN THE FAR SW GULF WHILE RIDGING REMAINS JUST N OF THE WATERS THROUGH THE PERIOD. A RECENT 0346 UTC ASCAT PASS CAPTURED E-SE WINDS OF 15-20 KT OVER THE NW AND N CENTRAL GULF WATERS. MODERATE TO FRESH TRADES AND SEAS OF 3 TO 6 FT WILL PREVAIL ACROSS THE MAJORITY OF THE FORECAST AREA THROUGH THE PERIOD. DIURNALLY DRIVEN N-NE 15-20 KT WINDS WILL OCCUR EACH EVENING ALONG THE YUCATAN COAST. A TROPICAL WAVE CURRENTLY IN THE FAR E CARIBBEAN WILL APPROACH THE YUCATAN CHANNEL AND PENINSULA SAT WHICH WILL WEAKEN THE RIDGING N OF THE GULF. SW N ATLC... LATEST BUOY OBS ACROSS THE AREA STILL REPORTING 8-12 FT SEAS NE-E OF THE BAHAMA CHAIN. THESE LARGE SWELLS GENERATED FROM LONG DEPARTED AND DISTANT HURRICANE IGOR WILL CONTINUE TO SUBSIDE TODAY THROUGH WED NIGHT. RIDGING WILL BUILD JUST N OF THE AREA THROUGH THE PERIOD. AS A RESULT FRESH TO STRONG EASTERLY TRADES WILL DEVELOP ACROSS THE WATERS WED THROUGH FRI DIMINISHING SLIGHTLY SAT AS THE RIDGE WEAKENS. THE STRONGEST TRADES WILL BE OVER THE SOUTHERN PORTION. CARIBBEAN SEA AND TROPICAL N ATLC... THE MONSOON TROUGH CURRENTLY EXTENDS FROM CENTRAL NICARAGUA ENE TO 14N75W. THE MONSOON TROUGH WILL SHIFT S TO ALONG 11N IN THE SW CARIBBEAN THROUGH THE WEEK. A TROPICAL WAVE THAT WAS IN THE TROPICAL N ATLC HAS NOW MOVED W OF THE MAJORITY OF THE LEEWARD ISLANDS AND INTO THE EXTREME E CARIBBEAN EXTENDING FROM THE NETHERLANDS ANTILLES S-SE TO TRINIDAD. SCATTERED SHOWERS AND TSTMS ARE OCCURRING WITHIN 240 NM EITHER SIDE OF THE WAVE. THE TROPICAL WAVE WILL MOVE TO ALONG 66W IN 24 HOURS...TO ALONG 70W/71W WED NIGHT...TO ALONG 76W/77W THU NIGHT 80W/81W FRI NIGHT...AND INTO THE GULF OF HONDURAS AND APPROACHING THE YUCATAN PENINSULA SAT. A TIGHT PRES GRADIENT BETWEEN THIS TROPICAL WAVE AND ATLC RIDGING TO THE N-NE OF THE AREA WILL RESULT IN INCREASING TRADES OF 20-25 KT IN THE VICINITY OF THE WAVE WITH SEAS BUILDING AS A RESULT TO AROUND 13 FT BY THE END OF THE WEEK. THERE IS ALSO A LOW CHANCE OF THE WAVE DEVELOPING INTO A TROPICAL CYCLONE IN THE NEXT 48 HOURS. WARNINGS... SW N ATLC... .NONE. CARIBBEAN... .NONE. TROPICAL N ATLC... .NONE. GULF OF MEXICO... .NONE. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ FORECASTER LEWITSKY