000 AGXX40 KNHC 241953 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 355 PM EDT WED JUN 24 2009 MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... THE UNUSUALLY STRONG TROUGH OVER THE AREA HAS WEAKENED SOME WITH THE TROUGH AXIS NOW ALONG A LINE THROUGH 31N74W ACROSS THE NORTHERN BAHAMAS AND WEST CUBA TO NORTHERN CENTRAL AMERICA. THE TROUGH EXTENDS ABOUT 500 NM EITHER SIDE OF THE AXIS. ELSEWHERE A WEAK TO MODERATE RIDGE IS PRESENT. TROUGH WILL DRIFT WEST AND WEAKEN FURTHER. BY LATE FRIDAY A WEAK TROUGH WILL EXTEND FROM NEAR CAPE HATTERAS ACROSS NORTH FLORIDA TO THE SOUTHWEST GULF OF MEXICO...AT THIS TIME THE TROUGH WILL EXTEND ABOUT 300 NM EITHER SIDE OF THE AXIS. ELSEWHERE A WEAK RIDGE IS PRESENT. THE TROUGH WILL THEN STRENGTHEN SOME AS A SHORTWAVE MOVES INTO THE NORTHERN PART OF THE TROUGH FROM THE SOUTHEAST UNITED STATES. BY LATE SUNDAY A MODERATE STRENGTH TROUGH WILL BE THE PRIMARY FEATURE WITH AN AXIS EXTENDING THROUGH BERMUDA TO ACROSS SOUTH FLORIDA TO THE NORTHERN GULF OF MEXICO COAST OF MEXICO. THIS TROUGH WILL DRIFT A LITTLE SOUTHEAST AND WEAKEN WITH A VERY FLAT HEIGHT FIELD OVER THE AREA. SURFACE... ASSOCIATED WITH THE UPPER TROUGH A SURFACE TROUGH IS IN THE SAME LOCATION. STRONG SOUTHERLY FLOW TO THE EAST OF THE TROUGH AXIS WILL CONTINUE THROUGH EARLY THURSDAY. 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 26N. 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. ACCOMPANYING THE SHORTWAVE LOW PRESSURE NORTH OF THE AREA WILL INCREASE THE SOUTHWESTERLY FLOW NORTH OF THE RIDGE AXIS BEGINNING LATE SATURDAY AND CONTINUING THROUGH MONDAY. TROPICAL WAVE IS NOT WELL DEFINED BY CONVECTION ANYMORE AND IS CARRIED IN THE EAST CARIBBEAN NEAR 67W. THE WAVE WILL MOVE ACROSS THE CARIBBEAN THROUGH SUNDAY. WARNINGS ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. FORECASTER LL. TROPICAL PREDICTION CENTER.