000 AGXX40 KNHC 071706 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 110 PM EDT SUN OCT 7 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... BROAD TROUGH IS OVER MOST OF THE AREA WITH AN APPROXIMATE AXIS FROM 31N55W TO ACROSS THE GREATER ANTILLES TO CENTRAL AMERICA. THIS SYSTEM WILL CHANGE LITTLE THROUGH TUESDAY. A MAJOR MID LATITUDE TROUGH BEGINS TO AFFECT THE NORTHWEST PART OF THE ATLANTIC AREA WEDNESDAY WITH SIGNIFICANT WESTERLIES DROPPING INTO THE AREA N OF 27N OVER THE EASTERN GULF OF MEXICO...FLORIDA AND THE WESTERN ATLANTIC ON THURSDAY. BY FRIDAY THE WESTERLIES WILL EXTEND TO 25N WITH A WEAK RIDGE OVER THE CARIBBEAN AND THE SOUTHEAST PART OF THE ATLANTIC AREA. SURFACE... SURFACE TROUGH EXTENDS MORE OR LESS ALONG THE UPPER TROUGH AXIS WITH MODERATE EASTERLY WINDS NORTH OF THE TROUGH. AS THE SURFACE RIDGE NORTH OF THE AREA WEAKENS MONDAY AND TUESDAY THE EASTERLIES WILL DIMINISH. AT THE SOUTHWEST PART OF THE TROUGH AN AREA OF INTEREST FOR POSSIBLE TROPICAL DEVELOPMENT IS NOTED IN THE NORTHWEST CARIBBEAN AND WILL BE MONITORED FOR POSSIBLE TROPICAL CYCLONE DEVELOPMENT. THE COLD FRONT ASSOCIATED WITH THE MID LATITUDE TROUGH WILL IMPACT THE NORTHERN PART OF THE AREA THURSDAY WITH WINDS TURNING MORE NORTHERLY N OF 28N AND BY FRIDAY MODERATE NORTH TO NORTHEAST WINDS WILL AFFECT MOST OF THE GULF OF MEXICO AND THE NORTHWEST PART OF THE ATLANTIC. RIDGE BUILDS WESTWARD NORTH OF THE TROPICAL ATLANTIC WEDNESDAY WITH INCREASING TRADES IN THE TROPICAL ATLANTIC AND BY FRIDAY IN THE FAR EASTERN CARIBBEAN. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER LL