000 AGXX40 KNHC 190508 MIMATS MARINE WEATHER DISCUSSION NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 130 AM EDT MON MAR 19 2007 MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W. A LARGE UPPER TROUGH BETWEEN 60W AND 70W ROTATING EWD TONIGHT. MID LEVEL HEIGHTS RISING W OF 80W IN NWLY FLOW. A WEAK SHORTWAVE WAS ALONG 100W MOVING SE. ON THE SURFACE TONIGHT AN OLD COLD FRONT EXTENDS FROM 31N60W TO 20N71W SEPARATING THE ATLC RIDGE TO THE E AND A POLAR HIGH ON THE CAROLINA COAST. STRONGEST WINDS TONIGHT ARE 25 KT E OF 50W UNDER A FAIRLY STRONG ATLC RIDGE AND W OF 70W TO 90W WHERE NE WINDS OF 20 TO 25 KT ARE BLOWING. GULF WINDS ARE MOSTLY 20 KT EXCEPT FOR THE NE CORNER. LATER DAY 1 STRONG SRN BRANCH OF WESTERLIES BECOMES MORE ZONAL WITH THE WEAK SHORTWAVE MOVING E TO 92W. ON THE SURFACE LATER DAY 1 THE ATLC COLD FRONT MOVES TO 31N55W 20N70W WITH LITTLE CHANGE IN AREA WINDS. FOR DAY 2 MID LEVEL RIDGING CONTINUES OVER THE CENTRAL CONUS RESULTING IN THE SRN BRANCH WEAKENING SOME. THE SHORTWAVE IN THE SRN BRANCH MOVES TO 85W. ON THE SURFACE DAY 2 THE ATLC FRONT DISSIPATES AND BOTH HIGH CENTERS BEGIN TO MERGE N OF 30N. LITTLE CHANGE TO THE OVERALL WIND PATTERN DAY 2. OUTLOOK PERIOD... FOR DAY 3 AS THE MID LEVEL RIDGE OVER THE CENTRAL CONUS MOVES SLOWLY E TO 82W..THE SHORTWAVE OVER THE NE GULF GETS TRAPPED AND BECOMES STATIONARY. MID LEVEL FLOW W OF 90W BECOMES MORE SWLY INDICATING DEEP TROUGHING OVER THE W COAST OF THE CONUS. ON THE SURFACE DAY 3 THE OLD POLAR HIGH OFF THE CAROLINA COAST DRIFTS E BUT STRENGTHENS AS THE UPPER RIDGE MOVES E THUS NE AND E WINDS INCREASE OVER THE ATLC W OF 60W TO 25 TO 30 KT. GULF WINDS ALSO INCREASE 20 TO 25 KT. ELSEWHERE REMAINS ABOUT THE SAME. FOR DAY 4 SRN BRANCH OF WESTERLIES TEMPORARILY WEAKENING AS RIDGING DEVELOPS OVER THE GULF AND SW ATLC. ON THE SURFACE DAY 4 ELY WINDS OVER MUCH OF THE REGION REMAIN 20 TO 25 KT EXCEPT FOR THE CARIB AND ATLC S OF 23N BETWEEN 65W AND 72W WHERE THE GRADIENT WEAKENS IN RESPONSE TO THE ERN GULF SHORTWAVE MOVING SE TO WRN CUBA. FOR DAY 5 MID LEVEL RIDGING OVER THE GULF SHIFTS SLOWLY E NUDGING THE SHORTWAVE OVER CUBA EWD. ON THE SURFACE DAY 5 THE PRESSURE GRADIENT S OF 23N BETWEEN 60W AND 74W AND N CENTRAL CARIB REMAINS WEAK WITH MOSTLY LIGHT WINDS. ELSEWHERE WINDS REMAIN 20 KT. WARNINGS... ATLANTIC... NONE. CARIBBEAN... NONE. GULF OF MEXICO... NONE. FORECASTER RRG