000 AGXX40 KNHC 281746 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 145 PM EST MON DEC 28 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W GULF OF MEXICO... A TROUGH OVER THE SW GULF WILL SHIFT SLOWLY W TONIGHT AND TUE AND LIE N TO S ALONG THE MEXICAN AND TEXAS E COASTS TUE NIGHT. LOW PRES IS EXPECTED TO DEVELOP ALONG THE TROUGH OVER NE TEXAS WITH THE LOW MOVING NE DRAGGING THE TROUGH BACK OVER THE WESTERN GULF. SINCE A SURGE OF COLD AIR IMMEDIATELY SWEEPS SE AND MERGES WITH THIS TROUGH EARLY THU...I CHANGED THE ALPHANUMERIC WORDING FROM TROUGH TO COLD FRONT FOR SIMPLICITY. EXPECTED THIS MERGED BOUNDARY TO REACH FL STRAITS SUNRISE FRI WITH ENTIRE GULF EXPERIENCING 20-25 KT NLY WINDS FRI. WINDS BECOME SLY OVER NW WATERS SAT AND DIMINISH TO NE AT 10 TO 15 KT ELSEWHERE. CARIBBEAN AND TROPICAL N ATLC W OF 55W... HIGH PRES WILL BUILD N OF AREA TONIGHT TIGHTENING THE PRES GRADIENT AND INCREASING NE TRADES TO 15-20 KT WITH THESE CONDITIONS SPREADING FROM W TO E THROUGH THU. THE GRADIENT WEAKENS OVER THE NW CARIBBEAN FRI. LONG PERIOD N SWELL WILL CONTINUE ACROSS THE ATLC WATERS E OF THE ANTILLES AND ALSO SEEP THROUGH THE EXPOSED ATLC PASSAGES THROUGH TUE...THEN GRADUALLY DECAYING WED THROUGH THU. ENHANCED WINDS AND SEAS ALONG COAST OF COLOMBIA THROUGH PERIOD. SW N ATLC S OF 31N W OF 55W... A STATIONARY FRONT EXTENDING NE FROM THE CENTRAL BAHAMAS WILL RECEIVE A REINFORCING NLY SURGE LATE TODAY PUSHING THE MERGED BOUNDARY E TO PSN FROM BERMUDA TO SE THE BAHAMAS SUNRISE TUE...AND THEN MOVE E OF 65W TUE NIGHT. POST FRONTAL NLY FLOW AT 20 TO 25 KT WILL DIMINISH AND BECOME SLY OVER THE NW WATERS WED NIGHT. A COASTAL TROUGH WILL SET UP IN THE RETURN FLOW WED AND WED NIGHT. LOW PRES IS EXPECTED TO DEVELOP ALONG THIS TROUGH TO THE N OF AREA DRAGGING ANOTHER COLD FRONT INTO THE NW WATERS THU NIGHT WITH THE FRONT REACHING THE SE WATERS SUNRISE SAT. WARNINGS... ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ FORECASTER NELSON