000 AGXX40 KNHC 060802 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 345 AM EDT MON APR 06 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... SHORTWAVE TROUGH ACROSS NORTHERN ALABAMA CANNOT GET ANY FURTHER SOUTH DUE TO BLOCKAGE BY WELL ANCHORED MID-UPPER LEVEL RIDGE CENTERED JUST S OF GULF OF TEHUANTEPEC IN E PAC WITH CREST REACHING AS FAR N AS 32N. ABUNDANT MOISTURE REACH GULF OF MEXICO N OF 28N FEEDING STRONG COLD FRONT FOR ITS CONVECTION. LARGE AMPLITUDE TROUGH ACROSS SW N ATLC WITH ANOTHER SHORTWAVE WELL N OF AREA SUPPORTS WEAKENING STATIONARY FRONT FROM 31N61W TO 24N69W. AS SHORTWAVE PULLS N THIS FRONT BECOMES DIFFUSE AND DISSIPATES IN 24-36 HRS. ELSEWHERE AT THE SURFACE... GULF OF MEXICO... STRONG COLD FRONT FROM 30N87W TO 19N95W BRINGS GALE FORCE WINDS TODAY AND TONIGHT S OF 25N W OF 90W. GALE WARNINGS EXPIRE LATE MON NIGHT BUT VERY STRONG WINDS REMAIN ACROSS ENTIRE BASIN TILL TUE DIMINISHING FROM W TO E BY LATE TUE NIGHT AS HIGH PRES RIDGE TAKE OVER. AS RIDGE DRIFTS E...SOUTHERLY RETURN FLOW BEGINS W OF 95W AND SPREADS E TO 89W AS NEW COLD FRONT APPROACHES AND ENTERS NW GULF LATE FRI. SW N ATLC... AS COLD FRONT FROM GULF OF MEXICO APPROACHES...INCREASING S-SW WINDS REACH GALE FORCE N OF 29N LATER TODAY. GALE IS SHORT- LIVED AS COLD FRONT SUPPORT WEAKENS. STRONGER WIND N OF AREA PRODUCED LARGE LONG PERIOD SWELLS WHICH MOVE SE MAINLY E OF 73W THU AND FRI. HIGH PRES CENTER 1025 MB BUILDS ALONG 70W THU AND FRI. CARIBBEAN... AS ATLC COLD FRONT FORCES HIGH PRES RIDGE EASTWARD AND FRONT ENTERS NW OF BASIN...PRES GRADIENT ACROSS CARIBBEAN SEA WEAKENS AND DIMINISHES TRADES ACROSS BASIN...INCLUDING ALONG COAST OF COLOMBIA. COLD FRONT BECOMES DIFFUSE WED AND RIDGE REBUILDS ACROSS SW N ATLC THU AND FRI WITH A RETURN OF STRONG TRADES. ATLC... .GALE WARNING N OF 29N...AMZ080. CARIBBEAN... NONE. GULF OF MEXICO... GALE WARNING S OF 25N W OF 93W...GMZ082. FORECASTER WALLY BARNES. TROPICAL PREDICTION CENTER.