000
AGXX40 KNHC 180549
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 
200 AM MON SEP 18 2006

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

UPPER LEVELS...
TROUGH OVER THE ATLANTIC AREA NORTH OF 25N THROUGH MONDAY NIGHT 
WILL BEGIN TO LIFT NORTHEAST TUESDAY AS A SHORTWAVE IN THE 
WESTERLIES MOVES EAST FROM THE SOUTHEASTERN U.S. BY WEDNESDAY A 
BROAD TROUGH WILL BE OVER THE EASTERN GULF OF MEXICO...FLORIDA 
AND THE ATLANTIC AREA NORTH OF 25N. BY THURSDAY THE TROUGH WILL 
HAVE MOVED EAST AND LIFTED NORTH OF THE AREA. ON FRIDAY A 
LONGWAVE MID LATITUDE TROUGH OVER THE CENTRAL U.S. WILL EXTEND 
OVER THE NORTHWEST PART OF THE GULF OF MEXICO.

OTHERWISE RIDGE OVER THE AREA WITH AN AXIS BETWEEN 20N AND 25N.

SURFACE...
COLD FRONT WILL MOVE OFF TEXAS COAST TODAY AND REACH FROM THE 
WESTERN FLORIDA PANHANDLE TO THE CENTRAL MEXICO COAST TUESDAY 
AND TO CENTRAL FLORIDA TO THE CENTRAL GULF OF MEXICO EARLY 
WEDNESDAY AND PASS SOUTHEAST OF THE GULF OF MEXICO DURING 
WEDNESDAY.
THE FRONT WILL EXTEND FROM NEAR 31N70W TO NORTH CUBA LATE 
WEDNESDAY THEN GET UNDEFINED AS IT APPROACHES THE WESTERN PART 
OF THE CIRCULATION ASSOCIATED WITH HELENE.  SOUTHERLY WINDS WILL 
APPROACH 20 KNOTS NORTH OF ABOUT 27N EAST OF THE FRONT.  WINDS 
NORTH OF THE FRONT WILL MOSTLY BE LESS THAN 20 KT.   

HELENE WILL AFFECT THE TROPICAL ATLANTIC REGION THROUGHOUT THE 
PERIOD AND THE SW NORTH ATLANTIC BEGINNING THURSDAY.  THE 
TROPICAL STORM FORCE WINDS WILL ONLY JUST REACH THE TROPICAL 
ATLANTIC AREA AND FORECAST TO BE EAST OF THE SW NORTH ATLANTIC 
AREA.

TRADES WILL BE LESS THAN NORMAL AND AS THE LOWER PRESSURE 
ASSOCIATED WITH HELENE APPROACHES THE AREA WINDS WILL FALL EVEN 
FURTHER.

WARNINGS...

ATLANTIC...
NONE.

CARIBBEAN...
NONE. 

GULF OF MEXICO...
NONE.

FORECASTER LL