000
AGXX40 KNHC 231848
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
300 PM EDT SUN AUG 23 2009

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

GULF OF MEXICO...
A WEAK COLD FRONT EXTENDING FROM N FLORIDA TO THE CENTRAL GULF 
NEAR 25N90W TO THE UPPER TEXAS COAST WILL DISSIPATE TONIGHT AS 
THE AIRMASS BEHIND THE FRONT MODIFIES MOVING ACROSS THE WARM 
GULF WATERS. A NARROW BAND OF SHOWERS AND TSTMS IS ASSOCIATED 
WITH THE FRONTAL BOUNDARY. WEAK SFC HIGH PRES OVER THE WESTERN 
GULF...ANALYZED 1015 MB NEAR 25N94W...WILL WEAKEN THROUGH MON 
THEN A SURFACE RIDGE WILL BUILD BACK ACROSS AREA TUE THROUGH THU 
PRODUCING IN GENERAL LIGHT TO MODERATE WINDS AND SEAS BELOW 5 
FT. WINDS WILL INCREASE TO 20 KT WITHIN 90 NM OF THE YUCATAN 
COAST DURING EVENINGS. 

CARIBBEAN AND THE TROPICAL N ATLC W OF 55W...
A TROPICAL WAVE ALONG 69W WILL MOVE W THROUGH THE CENTRAL 
CARIBBEAN THIS AFTERNOON THROUGH MON MORNING AND ACROSS THE W 
CARIBBEAN MON AND TUE REACHING THE YUCATAN PENINSULA WED. FRESH 
TO STRONG TRADE WINDS ARE IN THE WAKE OF THE WAVE. A QSCAT PASS 
FROM THIS MORNING SHOWED ELY WINDS OF 20 TO 25 KT BEHIND THE 
WAVE AXIS. SEAS ARE EXPECTED TO BUILD TO 8 TO 10 FT ACROSS THE 
CENTRAL CARIBBEAN AS THE WAVE CONTINUES TO MOVE WWD. NOAA BUOY 
42059 NEAR 15N67.5W IS REPORTING COMBINED SEA HEIGHT OF 8 FT.
A SECOND TROPICAL WAVE ALONG 50W WILL MOVE W-NW ACROSS THE 
TROPICAL N ATLC WATERS TONIGHT INTO MON PRODUCING AN INCREASE IN 
WINDS AND SEAS. E TO SE WINDS OF 20 TO 25 KT AND BUILDING SEAS 
OF UP TO 12 FT ARE EXPECTED BEHIND THE WAVE AXIS. 

SW N ATLC...
LONG PERIOD SWELLS GENERATED BY HURCN BILL ARE STILL AFFECTING 
THE FAR N PORTION OF THE FORECAST WATERS...BUT WILL GRADUALLY 
DIMINISH TONIGHT. THE N PORTION OF THE TROPICAL WAVE ALONG 50W 
WILL SPLIT OFF AND MOVE SLOWLY NW AS A SURFACE TROUGH ACROSS THE 
SW ATLC LATE MON THROUGH THU. A FRESH TO STRONG BREEZE AND SEAS 
IN THE 10-14 FT RANGE ARE EXPECTED BEHIND THE TROUGH. SEVERAL 
COMPUTER MODELS ARE INDICATING THE POTENTIAL FOR TROPICAL 
CYCLONE DEVELOPMENT IN ASSOCIATION WITH THIS SYSTEM LATER THIS 
WEEK. 
 

WARNINGS

ATLC...
NONE.

CARIBBEAN...
.NONE. 

GULF OF MEXICO...
.NONE

$$
FORECASTER GR