000
AGXX40 KNHC 301739
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
130 PM EDT MON JUL 30 2007

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

LONGWAVE UPPER LEVEL TROUGH DIGS SW ACROSS SW N ATLC FROM 31N73W 
TO 23N78W THEN INTO CARIBBEAN SEA ALONG 77W.  DOWNSTREAM BROAD 
MID-UPPER LEVEL RIDGE ANCHORED AT 24N65W HAS EFFECTIVELY BLOCKED 
TROUGH FROM FURTHER EWD INTRUSION.  AIRMASS REMAIN VERY DRY S OF 
24N E OF 74W DUE TO STRONG SUBSIDENCE UNDER RIDGE.  

ANOTHER BROAD MID-UPPER LEVEL RIDGE...THIS ONE OVER SE LOUISIANA 
...DOMINATES AIR FLOW OVER ENTIRE GULF OF MEXICO.  MOISTURE 
LADEN AIR MASS BRING CONVECTION TO NE GULF NEAR FLORIDA BIG BEND
AS WEAK TROUGH OVER LIE OVER GEORGIA-FLORIDA BORDER. 

AT THE SURFACE...WEAK LOW PRES 1010 MB JUST OFF GEORGIA COAST 
NOT EXPECTED TO INCREASE SW N ATLC WINDS SIGNIFICANTLY.  SECOND 
SWIRL OF CYCLONIC CIRCULATION NOW NW OF BERMUDA SHOULD CONTINUE 
NE AS EXTRA TROPICAL...IF IT EVER DEVELOPS INTO ANYTHING.  SO 
BASIN REMAINS UNDER HIGH PRES RIDGE THAT EXTENDS FROM CENTRAL 
ATLC TO GULF OF MEXICO. NE WINDS ALONG COLOMBIAN COAST IN 20 TO 
25 KT RANGE WITH TROPICAL WAVE ALONG 67W BUT LACKING CONVECTION 
AT THE MOMENT. TROPICAL WAVE IN VICINITY 47W HAS LOT OF CYCLONIC 
CURVATURE AND IS QUITE CONVECTIVE. CURRENTLY CYCLONIC SWIRLS ARE 
NOTED ALONG A LOW LEVEL AXIS FROM FROM 6N 55W TO 11N44W. CLOSELY 
MONITORING THIS WAVE FOR FURTHER DEVELOPMENT.   

WARNINGS...
ATLANTIC...
NONE.

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

FORECASTER WALLY BARNES