000 AGXX40 KNHC 010510 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 130 AM EDT SUN APR 1 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. THE LAST OF THE COLD AIR MOVING SE TONIGHT IS SLOWLY MAKING IT'S WAY E OVER THE ATLC BEHIND A VIGOROUS SHORTWAVE TROUGH. THE TROUGH IS ALONG 45W. MID LEVEL RIDGING LIES ALONG 80W..DOING IT'S BEST TO BLOCK A CLOSED OFF LOW CENTER OVER THE CENTRAL PLAINS. ON THE SURFACE TONIGHT THE SECOND LOW CENTER OVER THE MID ATLC HAS EXITED THE REGION MOVING NE. A COLD FRONT EXTENDS FROM THE LOW SW TO 20N50W 16N62W. AN OLD POLAR HIGH 1024 MB WAS NEAR 31N72W MOVING SLOWLY ESE. A WEAK FRONTAL TROUGH WAS OVER THE NW GULF AND GRADUALLY DISSIPATING. LATER DAY 1 MID LEVEL HEIGHTS SLOWLY RISING E OF 65W AS THE LARGE TROUGH LIFTS NE. THE MID LEVEL RIDGE CONTINUES EWD TO NEAR 75W WITH THE MID LEVEL FLOW BEHIND THE RIDGE BECOMING MORE SW TO W. ON THE SURFACE LATER DAY 1 THE ATLC FRONT MOVES TO 40W WHILE THE OLD POLAR AIRMASS CENTER MOVES TO NEAR 31N70W. STRONGEST WINDS REMAIN OVER THE CARIB AND ATLC S OF 23N AT 20 TO 25 KT. GULF WINDS SE TO 20 KT E OF 92W. FOR DAY 2 THE TREND CONTINUES AT MID LEVELS WITH HEIGHTS CONTINUING TO RISE SLOWLY E OF 60W. THE OLD MID LEVEL RIDGE FLATTENS OUT BETWEEN 60W AND 70W WHILE MAINTAINING A CENTER OVER THE NW CARIB. MID LEVEL FLOW W OF 75W BECOMES SW TO W. ON THE SURFACE DAY 2 THE OLD POLAR AIRMASS CENTER MOVES TO NEAR 30N62W MAINTAINING GUSTY NE WINDS OVER THE CARIB E OF 80W AND ATLC S OF 23N E OF 75W. SE WINDS TO 20 KT OVER PARTS OF THE GULF PREVAIL MAINLY IN RETURN FLOW W OF 90W. OUTLOOK PERIOD... FOR DAY 3 ZONAL MID LEVEL FLOW BECOMES MORE PREVALENT BUT STILL SOME WEAK SHORTWAVES MOVING SE OUT OF THE NRN BRANCH BUT MAINLY AFFECTING OUR REGION E OF 60W. OTHERWISE A BROAD MID LEVEL RIDGE HOLDS FIRM OVER THE SRN GULF AND WRN CARIB. ON THE SURFACE DAY 3 THE OLD POLAR AIRMASS BECOMES MORE ELONGATED E/W ALONG 28N WITH MOSTLY LIGHT WINDS N OF 20N. RETURN FLOW W OF 90W DECREASES TO 10 TO 15 KT. CARIB WINDS ALSO DIMINISH TO 15 TO 20 KT. FOR DAY 4 THE OLD MID LEVEL TROUGH OVER THE N CENTRAL ATLC STILL MANAGES TO CAPTURE SOME COLD AIR FROM ERN CANADA AND SEND IT SWD BETWEEN 50W AND 60W AGAIN LOWERING MID LEVEL HEIGHTS N OF 20N. ANOTHER CLOSED OFF MID LEVEL LOW MOVES ESE OVER THE GREATLAKES AND HEADS FOR THE CENTRAL ATLC. BASIC FLOW W OF 70W WNW. ON THE SURFACE DAY 4 A COLD FRONT APPROACHES 31N E OF 60W WITH INCREASING SW WINDS TO 25 KT. A SECOND COLD FRONT MOVES TOWARD THE NW GULF COAST. PRESSURE GRADIENT WEAKENS OVER REMAINDER OF THE REGION WITH MOSTLY LIGHT TO MODERATE WINDS. FOR DAY 5 MID LEVEL TROUGHING WILL PERSIST BETWEEN 40W AND 50W AS A POCKET OF COLD AIR BRUSHES THE REGION. THE GREATLAKES CLOSED LOW AT MID LEVELS MOVES OFF THE NE COAST TIGHTENING A CONFLUENT MID LEVEL FLOW BETWEEN 70W AND 85W. ON THE SURFACE DAY 5 A DISSIPATING COLD FRONT MOVES OVER ATLC WATERS E OF 50W WITH DIMINISHING WINDS. THE SECOND COLD FRONT MOVES OFF THE SE COAST BACK OVER CENTRAL FLOW DAY 5 WITH WEAK HIGH PRES BUILDING OVER THE GULF WITH NE WINDS TO 20 KT. ELSEWHERE WINDS REMAIN LIGHT TO MODERATE. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER RRG