000
AGXX40 KNHC 181657
MIMATS

MARINE WEATHER DISCUSSION   
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 
100 PM EDT TUE APR 18 2006

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

UPPER LEVEL...
LONGWAVE TROUGH IS OVER THE ATLANTIC AREA AND A LONGWAVE RIDGE 
IS OVER THE GULF OF MEXICO.  THE PATTERN WILL BE STATIONARY AND 
AMPLIFY SOME THROUGH EARLY THURSDAY. THEN BEGINNING LATE 
THURSDAY THE PATTERN WILL MOVE EAST WITH THE MAIN TROUGH EAST OF 
60W SUNDAY.  ON SUNDAY A WEAK BROAD TROUGH WILL BE OVER THE 
ATLANTIC AREA AND A WEAK TO MODERATE RIDGE WILL BE OVER THE GULF 
OF MEXICO.  THE ONLY STRONG SHORTWAVE WILL ROTATE THROUGH THE 
ATLANTIC TROUGH OVER THE NORTHEAST PART OF THE AREA LATE 
WEDNESDAY.

SURFACE...
COLD FRONT FROM NEAR 29N65W TO SOUTH FLORIDA WILL MOVE SOUTH AND 
WEAKEN.  THE FRONT WILL PASS EAST OF PUERTO RICO LATE THURSDAY.  
RIDGE WILL BE SLOW TO BUILD BEHIND THE FRONT WITH A RATHER WEAK 
PRESSURE PATTERN OVER THE AREA THROUGH FRIDAY WHEN THE RIDGE 
WILL BEGIN TO BUILD OVER THE ATLANTIC AREA.  A WEAK COLD FRONT 
WILL MOVE OFF THE SOUTHEAST U.S. COAST EARLY SUNDAY AND EXTEND 
ACROSS THE FAR NORTHWEST PART OF THE ATLANTIC AREA LATE SUNDAY.  
NO SIGNIFICANT FRONTAL SYSTEM WILL AFFECT THE GULF OF MEXICO.  

THE TRADES WILL BE WEAKER THAN NORMAL THROUGH WED NIGHT THEN  
STRENGTHEN TO NEAR NORMAL THURSDAY THROUGH SATURDAY WITH STRONG 
WINDS BY LATE SATURDAY...UP TO 30 KT...ALONG THE NORTH COAST OF 
SOUTH AMERICA...PRIMARILY COLOMBIA EAST OF RIO MAGDALENA.
      
WARNINGS...

ATLANTIC...
NONE.

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

FORECASTER LL