000 AGXX40 KNHC 231933 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 335 PM EDT TUE JUN 23 2009 MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... UNUSUALLY STRONG TROUGH OVER THE AREA NORTH OF THE GREATER ANTILLES FROM THE EAST GULF OF MEXICO TO ABOUT 60W WITH AN AXIS ALONG 73W. TROUGH WILL REMAIN IN PLACE THROUGH WEDNESDAY THEN WEAKEN. BY LATE THURSDAY A WEAK TROUGH WILL EXTEND FROM NEAR 31N75W ACROSS SOUTH FLORIDA TO EASTERN MEXICO. THE TROUGH WILL RETROGRADE IN THE GULF WITH THE TROUGH EXTENDING FROM NEAR 31N75W ACROSS CENTRAL FLORIDA TO NORTHERN MEXICO BY LATE SUNDAY. OTHERWISE A WEAK RIDGE WILL BE OVER THE AREA. SURFACE... ASSOCIATED WITH THE UNUSUALLY STRONG TROUGH A SURFACE TROUGH IS AT THE SURFACE IN THE SAME LOCATION. STRONG SOUTHERLY FLOW TO THE EAST OF THE TROUGH AXIS WILL CONTINUE THROUGH WEDNESDAY NIGHT. THE TROUGH WILL WEAKEN ALONG WITH THE UPPER TROUGH AND A WEAK RIDGE WILL BUILD FROM THE EAST ACROSS THE AREA ALONG 27N. AS THE TROUGH WEAKENS THE SOUTHERLY FLOW WILL DECREASE. BY FRIDAY THE RIDGE WILL EXTEND ACROSS THE ENTIRE AREA ALONG ABOUT 27N. THIS PATTERN WILL CONTINUE THROUGH SUNDAY. ACCOMPANYING THE BUILDING OF THE RIDGE TRADE WINDS IN THE CARIBBEAN WILL INCREASE FROM THE EAST WITH NEAR TO SLIGHTLY LESS THAN NORMAL TRADES THURSDAY THROUGH SUNDAY. TROPICAL WAVE IS WELL DEFINED BY CONVECTION OVER THE LESSER ANTILLES TODAY AND WILL MOVE ACROSS THE CARIBBEAN THROUGH SUNDAY. WARNINGS ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. FORECASTER LL. TROPICAL PREDICTION CENTER.