000 AGXX40 KNHC 171717 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 125 PM EDT TUE APR 17 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. UPPER LEVELS... MEDIUM LENGTH TROUGH OVER THE ATLANTIC EAST OF 77W. STRONG SHORTWAVE TROUGH OVER TEXAS. RIDGE BETWEEN THE TWO SYSTEMS. STRONG SHORTWAVE WILL MOVE EAST AND COMBINE WITH THE ATLANTIC TROUGH WEDNESDAY TO PRODUCE A LONGWAVE TROUGH OVER THE AREA EAST OF 87W WEDNESDAY NIGHT. THE LONGWAVE TROUGH WILL MOVE EAST AND BE EAST OF FLORIDA BY THURSDAY NIGHT WHERE IT WILL REMAIN THROUGH SUNDAY WHILE SLOWLY WEAKENING. RIDGE WILL BUILD OVER GULF OF MEXICO BEHIND THE TROUGH. SURFACE... STRONG LOW PRESSURE NORTH OF ATLANTIC AREA WITH ASSOCIATED COLD FRONT OVER THE SOUTHEAST PART OF THE ATLANTIC AREA. COLD FRONT WILL MOVE SOUTHEAST OF AREA TONIGHT WITH THE LOW NORTH OF THE AREA MOVING SLOWLY EAST. ASSOCIATED WINDS OF 20 KT WILL BE EAST OF THE AREA BY LATE THURSDAY. GALE IS EXPECTED TO BE IN THE NORTHEAST PART OF THE ATLANTIC AREA TONIGHT AND MOVE EAST OF 65W TONIGHT. LOW ASSOCIATED WITH THE STRONG SHORTWAVE WILL MOVE EAST ALONG 30N BUT WILL NOT DEVELOP MUCH UNTIL IN THE ATLANTIC AREA WITH WESTERLY WINDS OF 20 TO OCCASIONALLY 25 KT. THESE WINDS WILL MOVE EAST OF 65W BY EARLY SATURDAY. HIGH BUILD OVER SOUTHEAST U.S. BUT WINDS WILL BE MOSTLY LESS THAN 20 KT ONCE THE LOW MOVES EAST OF 65W. CARIBBEAN WILL HAVE WINDS LESS THAN NORMAL THROUGHOUT THE PERIOD. WARNINGS... ATLANTIC... AMZ080...GALE N OF 28N THROUGH MIDNIGHT TONIGHT. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER LL