000 AGXX40 KNHC 051954 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 345 PM EDT SUN APR 05 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... SHORTWAVE TROUGH IS OVER THE EASTERN ATLANTIC AREA EAST OF 68W. THE TROUGH WILL AMPLIFY SOME AND MOVE EAST PASSING EAST OF 60W MONDAY NIGHT AND EAST OF 55W LATE TUESDAY. MODERATE WESTERLIES NORTH OF 25N WEST OF 80W WITH SHORTWAVE OVER THE SOUTHERN GREAT PLAINS OF THE UNITED STATES. THE SHORTWAVE WILL DEVELOP AS IT MOVES EASTWARD WITH STRONG WESTERLIES NORTH OF 25N WEST OF 75W LATE MONDAY. THE TROUGH WILL CONTINUE TO AMPLIFY AND BY LATE TUESDAY THE TROUGH AXIS WILL BE ALONG ABOUT 78W WITH THE TROUGH COVERING THE AREA NORTH OF 20N ACROSS THE AREA FROM THE WESTERN GULF OF MEXICO TO NEAR 68W. STRONG WESTERLIES WILL BE NORTH OF THE GREATER ANTILLES FROM 75W TO 85W. THE TROUGH WILL DECREASE IN INTENSITY AS IT MOVES EAST WITH AN AXIS NEAR 70W LATE WEDNESDAY AND MODERATE WESTERLY WINDS NORTH OF 24N ACROSS THE AREA. THESE WESTERLIES WILL WEAKEN SOME THURSDAY AND FRIDAY. ELSEWHERE RIDGE CENTERED OVER THE WESTERN CARIBBEAN AND SOUTHERN MEXICO WILL CHANGE LITTLE THROUGH MONDAY THEN WEAKEN AND RETREAT SOUTHWARD AS THE TROUGH DEVELOPS. BY WEDNESDAY WEAK RIDGE WILL BE OVER THE SOUTHERN CARIBBEAN. AS THE TROUGH WEAKENS THE RIDGE WILL EXPAND NORTHWARD. SURFACE... GULF OF MEXICO... A STRENGTHEN COLD FRONT IS OVER THE GULF OF MEXICO FROM SOUTHEAST LOUISIANA TO THE COAST OF MEXICO NEAR 22N. THE FRONT WILL MOVE RAPIDLY ACROSS THE GULF REACHING THE STRAITS OF FLORIDA AND THE NORTHEAST YUCATAN PENINSULA LATE MONDAY AND CONTINUE TO MOVE SOUTHEAST OF THE AREA MONDAY NIGHT. HIGH PRESSURE WILL BUILD OVER TEXAS BEHIND THE FRONT. THE HIGH WILL MOVE TO OVER THE WEST GULF TUESDAY AND OVER THE CENTRAL AND EASTERN GULF WEDNESDAY. A TROUGH WILL DEVELOP OVER TEXAS WEDNESDAY AND CONTINUE OVER TEXAS THURSDAY. THE TROUGH WILL WEAKEN THURSDAY NIGHT AND A WEAKENING COLD FRONT WILL MOVE SOUTHEAST TO THE FAR NORTHWEST GULF BY LATE FRIDAY. ATLC... WEAK RIDGE OVER THE AREA WILL MOVE EAST AS COLD FRONT MOVES OFF THE SOUTHEAST UNITED STATES COAST MONDAY REACHING 31N75W TO NEAR HABANA CUBA LATE MONDAY AND 31N68W TO EAST CUBA LATE TUESDAY. THE FRONT WILL WEAKEN AND MOVE TO 31N61W TO 27N65W TO NEAR 19N71W LATE WEDNESDAY THEN BECOME DIFFUSE OVER THE SOUTHEAST PART OF THE AREA THURSDAY. TUESDAY AND WEDNESDAY THE RIDGE WILL BUILD ALONG 25N BEHIND THE FRONT. THE RIDGE WILL THEN MOVE NORTH REACHING 30N FRIDAY. CARIBBEAN... A WEAK RIDGE NORTH OF THE AREA WILL WEAKEN FURTHER AS A COLD FRONT MOVES OVER YUCATAN CHANNEL MONDAY NIGHT AND EXTENDS FROM THE WINDWARD PASSAGE TO EASTERN HONDURAS LATE TUESDAY AND THEN BECOMES DIFFUSE WEDNESDAY. RIDGE BUILD NORTH OF THE AREA THURSDAY AND FRIDAY. AS THE COLD FRONT MOVES ACROSS THE GULF OF MEXICO GALE WINDS WILL BE IN THE SOUTHWEST GULF BEHIND THE FRONT MONDAY. GALES WILL ALSO ACCOMPANY THE FRONT AS IT MOVES ACROSS THE ATLANTIC AREA MONDAY AND MONDAY NIGHT. ATLC... .GALE WARNING N OF 29N...AMZ080. CARIBBEAN... NONE. GULF OF MEXICO... GALE WARNING S OF 25N W OF 93W...GMZ082. FORECASTER LL. TROPICAL PREDICTION CENTER.