000
AGXX40 KNHC 310602
MIMATS

MARINE WEATHER DISCUSSION 
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
130 AM EST MON DEC 31 2007

MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA
AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W.

TIGHTENING MID LEVEL GRADIENT TONIGHT OVER SRN CONUS AS COLD AIR 
SPILLS SWD. BROAD MID LEVEL RIDGE HOLDING FIRM WITH CENTER NEAR 
25N70W BUT RIDGE WARING DOWN ON NW SIDE. ON THE SURFACE TONIGHT 
ATLC RIDGE CENTER NEAR 31N52W 1027 MB PRODUCING NE TO E WINDS 20 
TO 25 KT BETWEEN 50W AND 70W OVER ATLC AND CARIB E OF 80W. 
DISSIPATING COLD FRONT OVER E CENTRAL GULF WITH LIGHT WINDS. 

LATER DAY 1 NEW SURGE OF COLD AIR ALOFT MOVING SE OVER CENTRAL 
PLAINS WILL CONTINUE TO LOWER MID LEVEL HEIGHTS OVER DEEP SOUTH. 
MID LEVEL RIDGE SLIDING EWD IN RESPONSE TO LOWERING HEIGHTS. ON 
THE SURFACE LATER DAY 1 FRONT DISSIPATES OVER GULF. NEXT COLD 
FRONT OVER MID TX HEADING SE. LITTLE CHANGE WITH ATLC RIDGE AND 
WINDS. 

FOR DAY 2 LARGE UPPER TROUGH CARVING OUT OVER ERN CONUS WITH MID 
LEVEL RIDGE FLATTENING OUT ALONG 20N. ON THE SURFACE DAY 2..NEW 
YEARS DAY..STRONG COLD FRONT MOVES RAPIDLY SE OVER GULF WITH 
GALE CONDITIONS MOST SECTIONS. ATLC RIDGE SLOWLY WEAKENING AND 
TRADES DECREASING.  

OUTLOOK PERIOD...

FOR DAY 3 STRONG UPPER TROUGH MOVES TO ERN SEABOARD WITH AXIS 
ALONG 76W. MID LEVEL RIDGE BUILDING RAPIDLY IN WAKE OF TROUGH 
OVER PLAINS. ON THE SURFACE DAY 3 STRONG WINDS 25 TO 30 KT W OF 
A COLD FRONT THAT MOVES TO SE BAHAMAS. STRONG POLAR AIRMASS 1045 
MB MOVING TO SE TX. ATLC RIDGE SLIDES EWD OF 40W WHILE OLD LOW 
CENTER OVER ERN ATLC MOVES WWD AND OPENS TO A TROUGH ALONG 52W 
WITH WINDS 20 TO 25 KT OVER NE QUADRANT. 

FOR DAY 4 FAST MOVING UPPER TROUGH SWINGS EWD OFF ERN SEABOARD 
WITH AXIS ALONG 70W. LARGE UPPER RIDGE WITH AXIS ALONG 92W 
BEGINNING TO FLATTEN OUT AS UPPER FLOW BECOMES WLY. ON THE 
SURFACE DAY 4 STRONG POLAR RIDGE MOVING SLOWLY EWD TO 90W WITH 
STRONG N AND NE WINDS W OF A COLD FRONT TO 90W. FRONT MOVES TO 
31N60W SW TO 20N70W. NW CARIB WINDS NE 25 TO 30 KT. 

FOR DAY 5 SHRINKING POOL OF COLD AIR ALOFT ALL THATS LEFT OF 
STRONG UPPER TROUGH THUS WAVELENGTH DECREASING AS IT RACES EWD 
ALONG 55W. STRONG ZONAL FLOW OVER ERN CONUS WITH WEAKENED MID 
LEVEL RIDGE OVER SW GULF. ON THE SURFACE DAY 5 POLAR HIGH MOVES 
TO SE COAST WITH WINDS REMAINING GUSTY 20 TO 25 KT W OF COLD 
FRONT THAT MOVES TO 31N50W 18N62W. GULF WINDS TO 20 KT WITH 
RETURN FLOW SETTING UP W OF 90W. CARIB WINDS 20 TO 25 KT ALL 
SECTIONS EXCEPT SE CORNER. 

WARNINGS...
ATLANTIC...
NONE.

CARIBBEAN...
NONE. 

GULF OF MEXICO...
GALE CONDITIONS EXPECTED TUE AND TUE NIGHT.

FORECASTER RRG