000 AGXX40 KNHC 220535 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 135 AM EDT SUN MAR 22 2009 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... LONGWAVE TROUGH OVER THE AREA EAST OF A LINE FROM 31N81W TO THE BAY OF CAMPECHE. THE TROUGH WILL SLOWLY MOVE EAST AND WEAKEN SLIGHTLY THROUGH THE PERIOD AND BY THURSDAY BE EAST OF A LINE THROUGH 31N72W TO PANAMA WEST OF THE CANAL. MODERATE RIDGE WILL BE WEST OF THE TROUGH. SURFACE... FRONTAL TROUGH THROUGH 31N58W TO HISPANIOLA WILL MOVE EAST AND PASS EAST OF 60W MONDAY. RIDGE OVER THE EASTERN UNITED STATES COAST THROUGH TUESDAY WILL MOVE SLOWLY EAST WEDNESDAY AND THURSDAY TO ALONG 74W THURSDAY. TROUGH DEVELOP OVER TEXAS LATE SUNDAY WILL WEAKEN WEDNESDAY AND THURSDAY. ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER LL. TROPICAL PREDICTION CENTER.