000
AXNT20 KNHC 180614
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
205 AM EDT WED MAY 18 2011

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL 
AMERICA...GULF OF MEXICO...CARIBBEAN SEA...NORTHERN SECTIONS
OF SOUTH AMERICA...AND ATLANTIC OCEAN TO THE AFRICAN COAST
FROM THE EQUATOR TO 32N. THE FOLLOWING INFORMATION IS BASED
ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0545 UTC.

...TROPICAL WAVES...

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 54W/55W TO THE SOUTH OF 
11N. NUMEROUS STRONG RAINSHOWERS AND THUNDERSTORMS COVER SOUTHERN
AND SOUTHWESTERN FRENCH GUIANA AND SOUTHEASTERN AND NORTHWESTERN 
COASTAL SURINAME.  OTHER RAINSHOWERS AND THUNDERSTORMS ARE IN 
THE WATERS THAT ARE FROM LAND TO 8N BETWEEN 54W AND 57W...
AND FROM 10N TO 11N BETWEEN 55W AND 56W.

...THE ITCZ...

A MONSOON TROUGH EXTENDS FROM THE LIBERIA COAST NEAR 8N13W TO 
5N18W. THE ITCZ EXTENDS FROM 5N19W TO 3N30W...2N40W...TOWARD
THE EQUATOR ALONG 50W...ALONG THE COAST OF NORTHEASTERN
BRAZIL. NUMEROUS STRONG RAINSHOWERS AND THUNDERSTORMS ARE
IN THE COASTAL WATERS AND COASTAL PLAINS FROM LIBERIA TO GUINEA.
SCATTERED MODERATE RAINSHOWERS TO ISOLATED STRONG THUNDERSTORMS
IN CLUSTERS ARE FROM 2N TO 6N BETWEEN 4W AND 38W. 

...DISCUSSION...

INTERIOR MEXICO AND THE GULF OF MEXICO TO THE WEST OF 90W...

BROAD UPPER LEVEL ANTICYCLONIC FLOW SPANS THE AREA. BROAD 
SURFACE LOW PRESSURE SPANS INTERIOR MEXICO. A NORTHWEST-TO
-SOUTHEAST ORIENTED TROUGH EXTENDS FROM THE TEXAS BIG BEND
TO CENTRAL MEXICO...THROUGH THE ISTHMUS OF TEHUANTEPEC...TO
GUATEMALA AND BELIZE. 

FROM THE GULF OF MEXICO TO THE EAST OF 90W...INTO THE CARIBBEAN 
SEA...AND INTO THE ATLANTIC OCEAN TO THE WEST OF 60W...

UPPER LEVEL CYCLONIC FLOW WITH A DEEP LAYER TROUGH COVERS THE 
GULF OF MEXICO TO THE EAST OF 90W...INTO THE SOUTH CENTRAL 
CARIBBEAN SEA...AND THE ATLANTIC OCEAN THAT IS TO THE NORTH OF 
20N TO THE WEST OF 60W. A COMPARATIVELY NEW FRONTAL BOUNDARY
HAS DEVELOPED FROM SOUTHERN GEORGIA INTO THE FLORIDA PANHANDLE
AND THEN BEYOND LOUISIANA. BROAD SURFACE LOW PRESSURE COVERS 
FLORIDA AND SOME PARTS OF THE NORTHERN BAHAMAS. ISOLATED 
MODERATE RAINSHOWERS ARE TO THE NORTH OF 27N BETWEEN 76W AND 
77W. BROAD SURFACE LOW PRESSURE...OVERCAST MULTILAYERED CLOUDS
AND RAINSHOWERS AND POSSIBLE THUNDERSTORMS ARE FROM 15N NEAR
MARTINIQUE TO 28N BETWEEN 54W AND 74W. BROAD SURFACE LOW PRESSURE
CONTINUES FROM THE MONA PASSAGE TO NORTHWESTERN COASTAL 
VENEZUELA IN THE CARIBBEAN SEA.

THE REST OF THE ATLANTIC OCEAN THAT IS TO THE EAST OF 60W...

BROAD UPPER LEVEL CYCLONIC FLOW IS MOVING AROUND A 39N46W
CYCLONIC CIRCULATION CENTER. A SURFACE TROUGH EXTENDS FROM
A 1018 MB LOW PRESSURE CENTER THAT IS NEAR 39N49W...PASSING 
THROUGH 32N45W TO 27N49W TO 23N54W. LOW LEVEL STRATIFORM CLOUDS
WITH NO OBVIOUS AREAS OF PRECIPITATION ARE TO THE NORTH OF 20N
BETWEEN 30W AND 50W. A SURFACE RIDGE PASSES THROUGH 33N35W TO 
27N37W TO 13N40W. BROAD UPPER LEVEL CYCLONIC FLOW IS TO THE 
NORTH OF 25N BETWEEN AFRICA AND 33W.

FOR ADDITIONAL INFORMATION PLEASE VISIT
HTTP://WWW.HURRICANES.GOV/MARINE

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MT