000 AGXX40 KNHC 281743 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 140 PM EDT SUN JUN 28 2009 MARINE WEATHER DISCUSSION FOR THE GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO...A TROPICAL WAVE CURRENTLY OVER THE WESTERN BAY OF CAMPECHE WILL MOVE W OF AREA AROUND SUNSET TODAY. AS THE WAVE INTERACTED YESTERDAY WITH A CUT OFF CYCLONE OVER THE SW GULF AND A SECONDARY UPPER TROUGH OVER THE EASTERN GULF...THE WAVE SEPARATED LEAVING A SURFACE TROUGH IN THE VICINITY OF THE YUCATAN PENINSULA. THE REMNANTS OF THIS TROUGH IS ORIENTATED NE TO SW OVER THE S CENTRAL WATERS AND EXPECTED TO CHANGE LITTLE THROUGH MON NIGHT. THIS LOW TROUGH EFFECTIVELY SEPARATES THE ATLC RIDGE OVER THE SE GULF WATERS FROM A WEAK SURFACE HIGH OVER THE NW WATERS. A SECOND TROPICAL WAVE CURRENTLY ALONG 80W WILL OVERRUN THE REMNANTS OF THIS TROUGH MON NIGHT INTO TUE WITH THE WAVE CONTINUING W THROUGH THE BAY OF CAMPECHE TUE AND WED. BY THU AN E TO W RIDGE WILL EXTEND FROM SW FL TO THE MS DELTA WITH A BROAD TROUGH OVER THE BAY OF CAMPECHE. SW ATLC... AN E TO W RIDGE EXTENDS ACROSS THE AREA ALONG 23N. LATEST GUIDANCE SUGGESTS THE RIDGE WILL MEANDER BETWEEN 22N AND 24N THROUGH EARLY TUE THEN SHIFT N TO ALONG 26N WED AND 27N THU NIGHT AND FRI. A SERIES OF WEAK COLD FRONTS...OR TROUGHS...WILL SWEEP RAPIDLY E THROUGH THE NORTHERN WATERS BUT ONLY ACCOMPANIED BY A SLIGHT SW TO WSW WIND SHIFT. THE ASSOCIATED GRADIENT WILL REMAIN TIGHT WITH SLY WINDS PULSING BETWEEN 15 TO 25 KT THROUGH WED THEN THE GRADIENT IS EXPECTED TO RELAX SOME. AN UPPER TROUGH IS CURRENTLY RACING S OVER THE N WATERS ENHANCING A LARGE AREA OF TSTMS WHICH SHOULD DIMINISH AS THE TROUGH SLOWS TONIGHT. TROPICS INCLUDING CARIBBEAN...A TROPICAL WAVE CURRENTLY ALONG 80W WILL MOVE W OF THE CARIBBEAN MON AFTERNOON. A SECOND WAVE CURRENTLY IN THE CENTRAL ATLC SHOULD REACH ALONG 55W TUE MORNING AND MOVE THROUGH THE LESSER ANTILLES WED MORNING REACHING ALONG 74W FRI. FRESH ELY TRADES EXPECTED TO PERSIST OVER THE CENTRAL CARIBBEAN THROUGH THE PERIOD WITH GUIDANCE SUGGESTING SEAS BUILDING TO 14 FT NEAR 14N74W FRI. WARNINGS ATLC... .NONE. CARIBBEAN... .NONE. GULF OF MEXICO... .NONE. FORECASTER NELSON. TROPICAL PREDICTION CENTER.