000 AGXX40 KNHC 231859 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 300 PM EDT THU JUL 23 2009 MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO... GENERALLY TRANQUIL MARINE CONDITIONS PREVAIL ACROSS THE SOUTHERN GULF TODAY...WITH SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ALONG THE UPPER GULF COAST FROM LOUISIANA TO THE FLORIDA PANHANDLE. A WEAK 1017 MB HIGH PERSISTS ACROSS THE FAR NE GULF YIELDING LIGHT TO MODERATE ANTICYCLONIC FLOW ACROSS THE BASIN. HIGHEST WINDS AND SEAS WERE OCCURRING ACROSS THE SW AND W GULF WITH E-SE FLOW 10-15 KT AND SEAS 2-3 FT...AND WITH TYPICAL EVENING NELY FLOW ALONG THE NW AND W COASTS OF THE YUCATAN AROUND 15 KT. AN WEAK STATIONARY FRONT ACROSS SE TEXAS AND S LOUISIANA WILL SINK SE INTO THE NW AND N CENTRAL GULF THIS EVENING. THIS BOUNDARY IS EXPECTED TO BECOME ILL DEFINED BY FRI...BUT SUFFICIENT MOISTURE WILL LINGER ACROSS THE N GULF TO INTERACT WITH THE BROAD UPPER TROUGH ACROSS THE ERN TWO-THIRDS OF THE U.S. FOR SCATTERED AFTERNOON CONVECTION AGAIN FRI AND SAT...WITH THE FOCUS SHIFTING MORE E EACH DAY AS THE UPPER TROUGH DIGS S INTO THE N CENTRAL GULF. WIND AND SEAS WILL REMAIN GENERALLY TYPICAL OF THIS TIME OF YEAR...WITH LIGHT TO MODERATE WINDS DOMINATING MOST OF THE GULF...AND PERIODS OF 15 KT FLOW DEVELOPING ACROSS THE FAR W AND SW GULF...AND 15-20 KT DURING THE EVENINGS ALONG THE YUCATAN COAST AND INTO THE BAY OF CAMPECHE. SEAS THERE COULD BUILD 4 TO 5 FT SUN INTO MON DUE TO THIS ENHANCED FLOW. CARIBBEAN... THREE TROPICAL WAVES TRAVERSE THE CARIBBEAN AND CENTRAL AMERICA S OF 18N ALONG 60W...73W...AND 89W MOVING W AT 20-25 KT. ALL THREE WAVES HAVE ASSOCIATED SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS ALONG THE WAVE AXIS. THE FIRST TWO WAVES DO NOT HAVE STRONG WINDS AND WAVES...BUT THE THIRD WAVE ALONG 60W SIGNIFICANTLY ENHANCES WINDS AND WAVES TO 25 KT AND 9 FT WITH FORECAST BUILD UPS OF 25-30 KT AND SEAS 9-12 FT IN THE CENTRAL AND EASTERN CARIBBEAN FOR FRI AND SAT. STRONGEST WIND AND HIGHEST SEAS WILL BE ALONG THE COAST OF COLOMBIA. A BRIEF DECREASING TREND IN WINDS AND SEAS WILL BE SEEN ACROSS THE ERN CARIB LATE SUN AND MON...BEFORE THE NEXT WIND SURGE AND TROPICAL WAVE APPROACHES THE REGION TUE. ATLANTIC S OF 31N W OF 55W... THE MID TO UPPER TROUGH OFF THE SE U.S. COAST AND FLORIDA IS GRADUALLY LIFTING NE AND WILL EXIT THE AREA TO THE N TONIGHT...LIFTING THE ACTIVE WEATHER OF THE PAST 48 HOURS NE AND EWD WITH IT. AS THIS OCCURS...THE SURFACE TROUGH OFF THE E COAST OF FLORIDA WILL LIFT OUT...AND THE ATLC HIGH PRES RIDGE WILL BUILD SW INTO THE BAHAMAS...INDUCING A SIGNIFICANT IMPROVEMENT TO WIND AND SEAS ACROSS THAT AREA...AND MORE TYPICAL E TO SE TRADE WINDS. SEAS S OF 25N HAVE ALREADY BEGUN TO FADE TO 8 FT AND LESS. THE STRONG SLY FLOW E OF THE SURFACE TROUGH OFF OF FLORIDA WILL CONTINUE THROUGH THIS EVENING AND THE UPPER TROUGH DRAGS THIS LOW LEVEL FEATURE NEWD...AND WINDS AND SEAS WILL THUS BE SLOW TO FALL THERE UNTIL LATE EVENING. SELY WIND SWELL AT 8-9 SECONDS GENERATED ACROSS THE SW N ATLC THE PAST FEW DAYS IN THIS STRONG SELY FLOW INTO THE BAHAMAS HAS ALREADY BEGUN TO AFFECT THE E COASTS FROM FLORIDA TO THE OUTER BANKS...AND WILL PEAK AT 2-4 FT AT 9-10 SECONDS TONIGHT THROUGH FRIDAY MORNING... GENERATING MODERATE SURF ALONG THE COASTLINES...AND ACTIVE RIP CURRENTS WITHIN THE SURF ZONE. OTHERWISE...A RETURN TO MORE TYPICAL WIND AND SEAS IS EXPECTED ACROSS THE AREA AS HIGH PRESSURE AND E TO SE TRADES BUILD INTO THE REGION THIS WEEKEND...THEN INCREASE AGAIN MON INTO TUE WITH THE APPROACH AND ARRIVAL OF THE NEXT WIND SURGE AND ENSUING TROPICAL WAVE. WARNINGS ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. $$ FORECASTER FORMOSA