000 AGXX40 KNHC 181816 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 230 PM EDT SAT APR 18 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO... REMNANTS OF A FRONTAL TROUGH CONTINUE FROM THE W TIP OF CUBA TO THE SE TIP OF LA DEFINED BY ENHANCED SHOWERS OVER THE MIDDLE GULF. HIGH PRES ALONG CAROLINA COAST WILL SHIFT E MOVING ITS WESTWARD RIDGE CURRENTLY N OF AREA OVER THE NORTHERN GULF TONIGHT AND TO THE MIDDLE GULF EARLY SUN...THEN THE RIDGE RETRACTS E IN ADVANCE OF COLD FRONT MOVING OFF TX COAST EARLY SUN AFTERNOON. FRONT WILL REACH FROM FL PANHANDLE TO BAY OF CAMPECHE EARLY MON AND MOVE SE OF AREA TUE AFTERNOON. MODELS FLUCTUATING ON STRENGTH OF N FLOW BEHIND FRONT MON AND LATEST RUN IS A LITTLE STRONGER THAN PREVIOUS AND NOW INDICATING N 25-30 KT BRIEFLY MON OVER THE SW GULF. HIGH PRES WILL SHIFT ENE FROM THE TX COAST AT 26N TO THE CAROLINA COAST LATE THU NIGHT. SLY RETURN FLOW INCREASES THU NIGHT. SW N ATLC... A BROAD FRONTAL TROUGH FRONT EXTENDS FROM 28N55W TO HISPANIOLA WITH A REINFORCING BOUNDARY EXTENDING FROM 29N55W TO 23N78W. WINDS N OF THE FRONT AT 20-25 KT MAINLY IN A BAND FROM 23N-28N. SEAS HEIGHTS OF 8-12 FT IN NE SWELL IS AFFECTING MUCH OF THE AREA NE OF THE BAHAMAS. HIGH PRES OVER THE CAROLINA COASTS WILL SHIFT SE ACROSS THE NORTHERN PART OF THE AREA BECOMING AN E-W RIDGE ALONG 29N LATE SUN. THE HIGH CENTER PASSES TO THE S OF BERMUDA MON WITH A RIDGE SHIFTING S ALONG THE FL E COAST TO NEAR 25N LATE MON...NEAR 24N TUE THEN SHIFTING E OF THE BAHAMAS WED. THE NEXT COLD FRONT ENTERS THE NW WATERS MON NIGHT AND REACHING FROM BERMUDA TO WINDWARD PASSAGE WED NIGHT. CARIBBEAN AND TROPICAL N ATLC... A WEAK COLD FRONT WILL MOVE INTO THE NW CORNER OF THE TROPICAL ATLC ZONE BY SUNSET TODAY THEN WASH OUT BY LATE MON. ANOTHER WEAK COLD FRONT WILL ENTER THE YUCATAN CHANNEL LATE TUE REACHING NEAR THE WINDWARD PASSAGE THU BEFORE DISSIPATING. OTHERWISE... FRESH TRADE WINDS ARE FORECAST TO CONTINUE ACROSS THE REGION THROUGH THE PERIOD WITH LOCALLY ENHANCED WIND AND SEAS ALONG THE COAST OF COLOMBIA. LONG PERIOD NLY SWELL IS FORECAST TO SPREAD THROUGH THE E CARIBBEAN PASSAGES LATER TODAY THROUGH MON. ATLC... .NONE.. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. FORECASTER NELSON. TROPICAL PREDICTION CENTER.