000 AGXX40 KNHC 181825 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 225 PM EDT THU SEP 18 2008 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO... CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. GULF OF MEXICO... FRONTAL TROUGH EXTENDS FROM TAMPA BAY THROUGH 27N90W THEN SWD ALONG 96W TO A LOW NEAR 22N96W. ALTHOUGH A QUIKSCAT PASS FROM 1154 UTC INDICATED 20 TO 25 KT WINDS W OF THE FRONTAL TROUGH OVER THE BAY CAMPECHE AND 15 TO 20 KT WINDS OVER THE NW GULF...BUOYS AND CMAN SITES ARE ONLY SHOWING 10-15 KT. FOR NOW THE GFS...CMC AND CERTAIN EXTENT THE ECMWF ARE MOVING THE LOW NWD TO THE N-CENTRAL GULF BY LATE SAT/EARLY SUN THEN DISSIPATE IT BY LATE SUN. REMNANT TROUGH MOVES WWD MON AND DISSIPATES TUE. CARIBBEAN AND TROPICAL ATLC... A LOOK AT CONTINUITY...HOVMOELLER DIAGRAMS AND SATELLITE INDICATED THAT A TROPICAL WAVE WAS IN THE E CARIBBEAN ALONG 62W AND WAS PRODUCING A LARGE AREA CONVECTION TO THE E OF AN UPPER LEVEL LOW/TROUGH. A 1010 UTC QUIKSCAT PASS ALSO VERIFIED THE EXISTENCE OF THE WAVE AXIS ALONG 62W. ANOTHER WAVE WAS NOTED ALONG 72W. THE FIRST WAVE APPEARS TO BE THE MOST SIGNIFICANT FEATURE IN THE REGION AND IS FCST TO MOVE TO ALONG 66W/67W FRI... 70W LATE SAT INTO THE CENTRAL CARIBBEAN SUN AND MON AND W CARIBBEAN TUE. BY TUE BROAD SUB NORMAL PRESSURES AND LIGHT WINDS PREVAIL OVER THE CARIBBEAN WITH TRADES 15 KT OR LESS ENTIRE AREA. SW N ATLC... COLD FRONT EXTENDS FROM 31N76W TO 28N81W MOVING SE 5-10 KT. FURTHER E...PERSISTENT LOW LEVEL TROUGH EXTENDS FROM 30N67W TO 24N75W ATTM AND IS STILL EXPECTED TO WEAKEN SOME MORE AS IT CONTINUES MOVING W-NW WITH LITTLE ASSOCIATED CONVECTION. COLD FRONT IS FCST TO MERGE WITH THE TROUGH FROM 31N75W TO 24N77W BY LATE FRI. THE MERGED SYSTEM WILL DRIFT SLOWLY W THROUGH THE WEEKEND AND DISSIPATE BY LATE SUN. STRONG HIGH PRESS OVER THE NE U.S. BUILDS INTO THE AREA LATE MON AND TUE WITH AN INCREASE IN NE WINDS FAR NW PORTION. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER COBB. TROPICAL PREDICTION CENTER.