000 AGXX40 KNHC 250501 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 100 AM EDT SAT OCT 25 2008 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO... CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... SHORTWAVE TROUGH WILL MOVE TO THE NORTHWESTERN GULF OF MEXICO TODAY AND ACROSS THE NORTHERN GULF TONIGHT THEN WEAKEN IN THE NORTHERN PART OF THE ATLANTIC AREA SUNDAY AND SUNDAY NIGHT. A STRONG LONGWAVE TROUGH WILL FOLLOW THE SHORTWAVE. ON MONDAY THE LONGWAVE WILL EXTEND OVER THE AREA NORTH OF 25N WITH AN AXIS IN THE EAST GULF AND FLORIDA. THE LONGWAVE WILL CONTINUE TO EXTEND INTO THE AREA AND BY TUESDAY BE NORTH OF 23N WITH AN AXIS ALONG 78W AND COVER THE AREA INCLUDING THE EAST GULF OF MEXICO AND MOST OF THE ATLANTIC AREA. THE LONGWAVE WILL THEN BE PICKED UP BY WESTERLIES AND LEAVE WEAK TO MODERATE WESTERLY FLOW NORTH OF 25N ACROSS THE ENTIRE AREA BY LATE WEDNESDAY. OTHERWISE RIDGE IS OVER THE AREA. SURFACE... COLD FRONT FROM NORTH FLORIDA TO YUCATAN CHANNEL WILL MOVE SLOWLY EAST REACHING FROM NEAR 31N71W TO CENTRAL CUBA EARLY MONDAY. FRONT WILL THEN DRIFT EAST. A SECOND COLD FRONT WILL REINFORCE THE FIRST COLD FRONT WITH A STRONG HIGH PRESSURE BUILDING OVER THE NORTHWEST GULF OF MEXICO BEGINNING EARLY MONDAY AND RAPIDLY SPREADING EAST TO THE FIRST COLD FRONT BY TUESDAY. HIGH PRESSURE BUILD ALONG 30N BEHIND THE FRONT. BY LATE WEDNESDAY THE FRONT WILL HAVE MOVED JUST EAST OF THE NORTHERN LESSER ANTILLES. ATLANTIC... GALE WARNING...AMZ080...N OF 29N BETWEEN 75W AND 80W THROUGH 18 UTC TODAY. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER LL. TROPICAL PREDICTION CENTER.