000 AGXX40 KNHC 240708 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 210 AM EST TUE NOV 24 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W UPPER LEVELS... DEEP LAYER ANTICYCLONIC CIRCULATION IS CENTERED OVER THE EASTERN GREATER ANTILLES AND COVERS THE ENTIRE CARIBBEAN AND MOST OF THE ATLANTIC AREA. MODERATE WINDS ARE TO THE NORTH AND NORTHWEST OF THE RIDGE WITH SOUTHWESTERLIES OVER THE GULF OF MEXICO AND WESTERLIES NORTH OF 29N IN THE ATLANTIC AREA. THE HIGH WILL CONTRACT SOME TODAY AND WEDNESDAY AS A STRONG MIDDLE LATITUDE TROUGH DEVELOPS OVER THE CENTRAL AND EASTERN UNITED STATES. BY EARLY FRIDAY RIDGE WILL BE SOUTH OF ABOUT 22N AND MODERATE WESTERLIES WILL BE NORTH OF 22N WITH STRONG WESTERLIES OVER THE NORTHEAST GULF OF MEXICO AND FLORIDA AND THE ATLANTIC AREA NORTH OF 27N WEST OF 72W. THE STRONG SHORTWAVE WILL CONTINUE TO MOVE EAST AND CONTRACT NORTHWARD SOME SATURDAY BUT MODERATE TO STRONG WESTERLIES WILL CONTINUE NORTH OF ABOUT 20N. SURFACE... AHEAD OF THE NEXT COLD FRONT NORTH OF THE TRADES THERE IS A WEAK PRESSURE PATTERN WITH WEAK SURFACE WINDS MOSTLY LESS THAN 15 KNOTS. NEXT COLD FRONT... ASSOCIATED WITH THE STRONG MIDDLE LATITUDE TROUGH...WILL MOVE OFF THE TEXAS COAST TODAY AND REACH FROM NORTH FLORIDA TO EASTERN BAY OF CAMPECHE MIDDAY WEDNESDAY AND MOVE TO THROUGH 31N73W TO CENTRAL CUBA AND CONTINUE ON TO THE NORTHWEST CARIBBEAN MIDDAY THURSDAY AND MOVE TO THROUGH 31N67W TO ACROSS EASTERN CUBA TO GULF OF HONDURAS MIDDAY FRIDAY AND TO 31N60W TO HAITI THEN DIFFUSE OVER THE NORTHWEST CARIBBEAN MIDDAY SATURDAY. A TROUGH WILL DEVELOP AHEAD OF THE FRONT OVER THE EASTERN GULF OF MEXICO TONIGHT AND A LOW WILL DEVELOP WITHIN THE TROUGH THAT WILL MOVE ACROSS NORTH FLORIDA WEDNESDAY AND BECOME ABSORBED BY THE APPROACHING COLD FRONT WHEN THE LOW MOVES OVER THE NORTHWEST PART OF THE ATLANTIC AREA WEDNESDAY. WINDS NEAR THE LOW WILL APPROACH 30 KNOTS. FRONTAL TROUGH WILL INTENSIFY FRIDAY AS THE STRONGEST PART OF THE SHORTWAVE MOVES PAST THE AREA WITH INCREASING SURFACE WINDS IN THE ATLANTIC AREA FRIDAY. WINDS WILL DECREASE SATURDAY AS THE PRESSURE GRADIENT WEAKENS. TRADES OF 20 KNOTS OR MORE ARE CONFINED TO SOUTH OF 17N EAST OF 82W TODAY. WINDS WILL BE UP TO 30 KNOTS IN THE SOUTH CENTRAL CARIBBEAN. THE WINDS WILL THEN WEAKEN TONIGHT THROUGH THURSDAY AND REMAIN WEAK FRIDAY AND SATURDAY AS THE ABOVE MENTIONED FRONTAL TROUGH WEAKENS THE RIDGE NORTH OF THE AREA. OTHERWISE WINDS WILL BE LESS THAN 20 KT. WARNINGS... ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. $$ FORECASTER LL