000 AGXX40 KNHC 081707 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 108 PM EDT MON OCT 8 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 31N60W TO ACROSS THE GREATER ANTILLES TO CENTRAL AMERICA. THIS SYSTEM WILL SLOWLY WEAKEN THROUGH WEDNESDAY. A MAJOR MID LATITUDE TROUGH WILL BEGIN 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 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. THIS PATTERN WILL CHANGE LITTLE SATURDAY. 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 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 GULF OF MEXICO WEDNESDAY WITH WINDS TURNING MORE NORTHERLY N OF 28N. HIGH NORTH OF THE AREA WILL BE REINFORCED WITH CONTINUING NORTHEASTERLY WINDS OVER MOST OF THE GULF OF MEXICO. THE WINDS OVER NORTHWEST PART OF THE ATLANTIC AREA WILL ALSO TURN MORE NORTHERLY THURSDAY AS THE COLD FRONT MOVES OFF THE SOUTHEAST U.S. COAST. THE FRONT WILL REACH THE BERMUDA AREA SAT. RIDGE BUILDS WESTWARD NORTH OF THE TROPICAL ATLANTIC WEDNESDAY WITH INCREASING TRADES IN THE TROPICAL ATLANTIC AND BY FRIDAY IN THE FAR EASTERN CARIBBEAN. THE RIDGE WILL WEAKEN SOME SATURDAY. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER LL