000 AGXX40 KNHC 310509 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 130 AM EDT SAT MAR 31 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. A STRONG SHORTWAVE TROUGH DIVING SE OVER MID OCEAN TONIGHT ALONG 58W. STRONG SINKING AIR AT MID LEVELS BETWEEN 60W AND 75W WILL MAINTAIN SURFACE RIDGE OVER SW ATLC. MID LEVEL RIDGING ALONG 85W BLOCKING A NEW SHORTWAVE OVER THE S CENTRAL PLAINS. ON THE SURFACE TONIGHT 1005 MB LOW NEAR 27N47W MOVING NE WITH GALE CONDITIONS ON E SEMICIRCLE. A COLD FRONT EXTENDS FROM 31N49W TO 21N65W BACK OVER THE BAHAMAS. MODERATE HIGH PRES ALONG SE COAST MAINTAINING 20 TO 25 KT BEHIND FRONT AND OVER N CARIB AND MUCH OF GULF TONIGHT. LATER DAY 1 LOOK FOR EWD MOVEMENT OF SHORTWAVE TO 50W WHILE MID LEVEL RIDGE SLIDES E TO 82W. STRONG SHORTWAVE OVER CENTRAL PLAINS TRYING TO CLOSE OFF AND MOVE NE. ON THE SURFACE LATER DAY 1 GALE CENTER MOVES NE OF AREA BUT SLY WINDS TO 30 KT CONTINUE N OF 27N E OF 43W. A 1023 MB HIGH MOVES TO NEAR 31N72W WITH GUSTY N AND NE WINDS CONTINUING W OF 50W AND OVER CARIB AND GULF. FOR DAY 2 WLY COMPONENT IN MID LEVEL WINDS INCREASING WITH MID LEVEL FEATURES LOOSING THEIR MERIDIONAL EXTENT. MID TROUGH ALONG 50W BEGINNING TO EXIT THE AREA. CLOSED OFF LOW OVER SRN GREATLAKES MOVES ENE WITH MID LEVEL RIDGE MOVE E TO 77W. ON THE SURFACE DAY 2 WEAKENING COLD FRONT MOVES TO 40W WITH DECREASING WINDS W OF FRONT. A 1025 MB HIGH DRIFTS E TO NEAR 31N69W MAINTAINING GUSTY WINDS OVER CARIB AND E GULF. OUTLOOK PERIOD... FOR DAY 3 MID LEVEL RIDGE FLATTENING OUT WITH CENTER LOCATED OVER NW CARIB. MID LEVEL FLOW CONTINUES TO BECOME MORE ZONAL. ON THE SURFACE DAY 3 WEAKENING COLD FRONT MOVES E OF 40W WHILE OLD POLAR HIGH 1023 MB MOVES TO NEAR 28N68W. STRONGEST WINDS REMAIN OVER CARIB AT 25 KT WHILE GULF WINDS MOSTLY LIGHT. FOR DAY 4 MID LEVEL HEIGHTS CONTINUE TO RISE E OF 70W WITH THE TREND TO A MORE ZONAL FLOW CONTINUING. ON THE SURFACE DAY 4 OLD POLAR HIGH WEAKENING TO 1020 MB WHILE REMAINING ALONG 27N. A COLD FRONT APPROACHES THE NRN BORDER E OF 70W WILL INCREASE SW WINDS 20 TO 25 KT. RETURN FLOW SETS UP W OF 90W AT 15 TO 20 KT. CARIB WINDS WEAKEN TO 15 TO 20 KT. FOR DAY 5 FAIRLY STRONG SHORTWAVES IN NRN BRANCH OF WESTERLIES TRYING TO PENETRATE S OF 35N. ONE SHORTWAVE ALONG 55W WHILE ANOTHER OVER GREATLAKES. BASIC MID LEVEL FLOW S OF 35N W TO WNW. MID LEVEL RIDGE REMAINS ALONG 74W BUT WEAKER. ON THE SURFACE DAY 5 ATLC COLD FRONT SWINGS RAPIDLY S E OF 65W IN STRONG CYCLONIC CURVATURE WITH WINDS 25 TO 30 KT. NEW COLD FRONT MOVES TO NRN GULF WITH NLY WINDS TO 20 KT..OTHERWISE SRN GULF..SW ATLC W OF 70W AND CARIB WINDS MOSTLY LIGHT TO MODERATE. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER RRG