000
AGXX40 KNHC 181704
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
105 PM EDT WED APR 18 2007

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

UPPER LEVELS...
BROAD LONGWAVE TROUGH OVER THE AREA N OF THE ANTILLES EAST OF 
87W. RIDGE OVER TEXAS.  BOTH SYSTEMS WILL AMPLIFY THROUGH FRIDAY 
AND MOVE SLIGHTLY EAST WITH THE TROUGH EAST OF 80W AND THE RIDGE 
WEST OF 80W FRIDAY. SATURDAY THROUGH MONDAY BOTH SYSTEMS WILL 
BECOME TILTED WITH THE RIDGE AXIS EXTENDING ALONG THE EASTERN 
U.S. COAST THEN SOUTHWEST TO NEAR 20N100W AND THE TROUGH AXIS 
FROM NEAR BERMUDA TO NEAR 20N90W.

SURFACE...
IN THE GULF OF MEXICO REGION...BECAUSE OF THE RIDGE...NOT MUCH 
WILL HAPPEN WITH HIGH PRESSURE CENTERED NORTH OF THE AREA 
THROUGH MONDAY.  DURING SATURDAY THE RIDGE WILL STRENGTHEN WITH 
WINDS APPROACHING 20 KT OVER THE GULF SUNDAY AND MONDAY.

IN THE ATLANTIC AREA THE WINDS FROM THE STRONG LOW PRESSURE 
NORTH OF THE AREA WILL MOVE EAST OF 65W TONIGHT.  A SHORTWAVE 
MOVING THROUGH THE ABOVE MENTIONED LONGWAVE TROUGH WILL DEVELOP 
A LOW EAST OF NORTH FLORIDA TONIGHT AND THE LOW WILL MOVE EAST 
AND STRENGTHEN WITH 20 KT WINDS NEAR THE LOW DEVELOPING 
THURSDAY. THE LOW WILL PASS EAST OF 65W LATE THURSDAY AND THE 
ASSOCIATED WINDS WILL ALSO MOVE EAST OF 65W THURSDAY NIGHT. NOT 
MUCH ELSE HAPPENS IN THE ATLANTIC AREA THROUGH MONDAY WITH HIGH 
PRESSURE BUILDING NORTH OF THE AREA.
  
IN THE CARIBBEAN THE LACK OF HIGH PRESSURE NORTH OF THE AREA 
THROUGH THURSDAY NIGHT WILL BE ASSOCIATED WITH LIGHT WINDS BUT 
AS THE RIDGE BUILDS WELL NORTH OF THE AREA SATURDAY THROUGH 
MONDAY THE PRESSURES OVER NORTHERN SOUTH AMERICA WILL RISE 
CONTINUING A LESS THAN NORMAL PRESSURE GRADIENT AND THE LESS 
THAN NORMAL WINDS OVER THE AREA THROUGH MONDAY.  EASTERLY WINDS 
WILL INCREASE SUNDAY AND MONDAY NORTH OF 20N DUE TO THE RIDGE 
BUILDING NORTH OF THE AREA.

WARNINGS...
ATLANTIC...
NONE.

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

FORECASTER LL