000
AGXX40 KNHC 290509
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
130 AM EDT THU MAR 29 2007

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

TWO DOMINANT FEATURES AT MID LEVELS TONIGHT. A LARGE TROUGH OFF 
THE NEW ENGLAND COAST AND A LARGE RIDGE ALONG 90W OVER THE ERN 
US. WEAK SHORTWAVE TROUGHS ARE DIVING SE BETWEEN THE TWO 
SYSTEMS. ONE EXITING ALONG 55W ANOTHER BACK ALONG 70W AND A 
THIRD UPSTREAM OVER THE ERN CAROLINAS. ON THE SURFACE TONIGHT A 
STATIONARY FRONT EXTENDS FROM 31N39W SW TO 22N55W. A WEAK LOW 
WAS N OF PUERTO RICO AND A 1022 MB HIGH WAS NEAR 31N75W. 
STRONGEST WINDS WERE OVER THE TROPICAL ATLC AND NW GULF WITH 20 
TO 25 KT. SW ATLC AND NW CARIB WINDS WERE NE 20 KT TONIGHT. 

LATER DAY 1 LOOK FOR MID LEVEL HEIGHTS TO CONTINUE FALLING W OF 
50W AS A NEW SURGE OF COLD AIR MOVES RAPIDLY SWD ALONG 70W. 
LITTLE CHANGE TO THE MID LEVEL RIDGE ALONG 90W. ON THE SURFACE 
LATER DAY 1 THE WEAK LOW MOVES ENE TO NEAR 23N55W. HIGH PRESSURE 
REMAINS ALONG THE SE COAST WHILE A COLD FRONT MOVES S TO 30N. 
MOST AREAS WITH MODERATE WINDS. 

FOR DAY 2 MID LEVEL TROUGHING CONTINUES W OF 50W AS A STRONG 
SHORTWAVE DROPS S TO 30N60W. MID LEVEL RIDGING BEGINS TO MOVE 
EWD SLOWLY AS A NEW SYSTEM MOVES OUT OF THE ROCKIES. ON THE 
SURFACE DAY 2 LOW PRES STRENGTHENS AS IT MOVES NE TO NEAR 25N48W 
WITH THE GRADIENT TIGHTENING ON THE E SIDE AND WINDS INCREASE TO 
25 KT. HIGH PRES OFF THE SE COAST STRENGTHENS UNDER THE MID 
LEVEL RIDGE AND WINDS INCREASE W OF 60W TO 20 TO 25 KT MOST 
AREAS BETWEEN 18N AND 28N.

OUTLOOK PERIOD...

FOR DAY 3 STRONG SHORTWAVES CONTINUE TO CARVE OUT THE MID LEVEL 
TROUGH OVER THE WRN ATLC W OF 40W. THE MID LEVEL RIDGE MOVES TO 
NEAR 85W WHILE A NEW TROUGH MOVES INTO THE CENTRAL PLAINS. ON 
THE SURFACE DAY 3 THE ATLC LOW CENTER CONTINUES TO DEEPEN AS IT 
MOVES N OF THE AREA NEAR 33N47W. WINDS 25 TO 30 KT N OF 28N E OF 
52W WITH THE DEPARTING LOW. A MODERATE HIGH 1024 MB SITS OFF THE 
SE COAST MAINTAINING GUSTY WINDS S OF 25N AND OVER THE GULF. 

FOR DAY 4 THE LARGE MID LEVEL TROUGH CONTINUES TO MOVE EWD TO 
ALONG 50W WHILE THE RIDGE MOVES TO 75W. THE PLAINS SHORTWAVE 
HEADS NE TOWARD THE GREATLAKES WHILE THE MID LEVEL FLOW W OF 90W 
TURNS ZONAL. ON THE SURFACE DAY 4 A COLD FRONT EXITS THE AREA 
ALONG 40W AS A 1024 MB HIGH MOVES SLOWLY E. MOST ATLC WINDS 
LIGHT TO MODERATE EXCEPT N OF 27N E OF 60W WHERE THEY CONTINUE 
20 TO 25 KT. GULF WINDS DIMINISH AS THE HIGH MOVES E BUT REMAIN 
15 TO 20 KT. CARIB WINDS S OF 18N E OF 80W 20 TO 25 KT.

FOR DAY 5 A LARGE CLOSED MID LEVEL LOW DEVELOPS WITH A CENTER 
NEAR 38N47W. THE OLD MID LEVEL RIDGE ALONG 75W FLATTENS OUT WITH 
A CENTER DEVELOPING OVER THE NW CARIB. ON THE SURFACE DAY 5 
STRONGEST WINDS WILL REMAIN N OF 27N E OF 55W WITH 20 TO 25 KT 
AND OVER THE CARIB E OF 80W AT ABOUT THE SAME VALUE. ELSEWHERE 
WINDS MOSTLY LIGHT TO MODERATE.

WARNINGS...
ATLANTIC...
NONE.

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

FORECASTER RRG