000 AGXX40 KNHC 171856 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 300 PM EDT WED JUN 17 2009 MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO... HIGH PRES ANCHORED OVER N-CENTRAL GULF WATERS REMAINS IN CONTROL ACROSS MUCH OF THE GULF REGION. A SFC TROUGH IS MOVING ACROSS THE BAY OF CAMPECHE THIS AFTERNOON AND IS FORECAST TO BECOME DIFFUSE TONIGHT OVER MAINLAND MEXICO. E TO SE WINDS OF UP TO 20 KT ARE NOTED BEHIND THE TROUGH AXIS PER A RECENT QSCAT PASS. A TROPICAL WAVE CURRENTLY OVER THE YUCATAN PENINSULA ALONG 88W FOLLOWS THE TROUGH AND WILL MOVE THROUGH THE BAY OF CAMPECHE TONIGHT AND THU...KEEPING WINDS IN THE 15 TO 20 KT RANGE. WINDS AND SEAS ARE FORECAST TO DIMINISH ACROSS THE SW PORTION OF THE GULF FRI THROUGH SUN UNDER THE INFLUENCE OF A RIDGE. WEAK COLD FRONT MOVE INTO NE WATERS THU AND DISSIPATE FRI. LIGHT WINDS BRIEFLY SHIFT NW IN WAKE OF FRONT. CARIBBEAN AND TROPICAL N ATLC W OF 55W... TRADE WINDS HAVE INCREASED TO 25 KT JUST OFFSHORE COAST OF COLOMBIA IN RESPONSE TO A TIGHTENING PRES GRADIENT BETWEEN THE ATLC RIDGE N OF AREA AND LOW PRES OVER SOUTH AMERICA BUILDING SEAS TO 6-9 FT. THESE CONDITIONS ARE EXPECTED TO PERSIST THROUGH AT LEAST SAT. A TROPICAL WAVE IS MOVING ACROSS THE YUCATAN PENINSULA. SE WINDS OF 20 KT AND MAX SEAS OF 8 FT ARE FOUND BEHIND THE WAVE AXIS OVER THE FAR WESTERN CARIBBEAN PARTICULARLY S OF 18N W OF 85W. THESE CONDITIONS ARE EXPECTED TO DIMINISH IN ABOUT 18 TO 24 HOURS. ANOTHER TROPICAL WAVE PRESENTLY ALONG 38W IS FORECAST TO APPROACH THE TROPICAL N ATLC SAT. SUBTROPICAL ATLC W OF 65W... AS PREVIOUSLY MENTIONED...A SFC LOW HAS DEVELOPED OFF THE COAST OF THE CAROLINAS AND IS FORECAST TO MOVE MAINLY EWD TO A POSITION NEAR 32N74W THU MORNING...INCREASING SW FLOW OVER THE N WATERS FRI AND SAT AS IT MOVES NE ACROSS THE ATLC OCEAN. THE ATTENDANT TROUGH WILL MOVE ACROSS THE NW WATERS THIS AFTERNOON EXTENDING FROM 31N75W TO 28N77W THU MORNING. THE TROUGH WILL DISSIPATE ACROSS THE AREA BY THU NIGHT. OTHERWISE...AN E TO W RIDGE ALONG 26N WILL DOMINATE THE AREA THROUGH SUN. LONG PERIOD SWELLS FROM THE NE WILL SPREAD ACROSS THE AREA FRI THROUGH SAT REACHING THE BAHAMAS AND THE TROPICAL N ATLC SUN. WARNINGS ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. FORECASTER GR. TROPICAL PREDICTION CENTER.