000
AXNT20 KNHC 271137
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL  
805 AM EDT FRI MAY 27 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1015 UTC.

...THE ITCZ...

FROM GUINEA NEAR 10N13W TO 5N26W TO THE EQUATOR ALONG 40W...
AND CONTINUING ALONG THE EQUATOR INTO EXTREME NORTHEASTERN
BRAZIL TO 50W. ISOLATED MODERATE RAINSHOWERS TO LOCALLY STRONG 
THUNDERSTORMS ARE WITHIN 120 NM ON EITHER SIDE OF 7N11W 4N22W
3N33W...TO THE EQUATOR ALONG 43W...TO 1S52W.

...DISCUSSION...

THE GULF OF MEXICO...

AN UPPER LEVEL TROUGH IS PUSHING ITSELF THROUGH THE EASTERN HALF 
OF THE GULF OF MEXICO. ISOLATED MODERATE RAINSHOWERS COVER THE 
ATLANTIC OCEAN FROM 21N IN THE BAHAMAS TO 30N BETWEEN 75W AND 
87W IN THE FLORIDA PANHANDLE. THE INDIVIDUAL SHOWERS ARE 
DISPERSED RANDOMLY ACROSS THE AREA. A BROAD SURFACE RIDGE PASSES
THROUGH 33N67W IN THE ATLANTIC OCEAN TO 29N77W INTO THE SOUTH 
CENTRAL GULF OF MEXICO.
 
THE CARIBBEAN SEA...

BROAD UPPER LEVEL CYCLONIC WIND FLOW COVERS THE AREA TO THE 
NORTHWEST OF THE LINE THAT RUNS FROM CENTRAL HISPANIOLA TO EAST 
CENTRAL NICARAGUA. UPPER LEVEL ANTICYCLONIC FLOW COVERS THE REST 
OF THE CARIBBEAN SEA...AWAY FROM THE TROUGH. BROAD SURFACE TO 
LOW LEVEL CYCLONIC FLOW COVERS THE SOUTHWESTERN CORNER OF THE 
AREA AND COLOMBIA AND VENEZUELA. STRONG RAINSHOWERS AND 
THUNDERSTORMS IN INDIVIDUAL CLUSTERS REMAIN IN NORTHWESTERN 
VENEZUELA IN LAKE MARACAIBO...AND FROM 7N TO 12N BETWEEN
73W AND 76W IN COLOMBIA AND ITS COASTAL WATERS.

THE ATLANTIC OCEAN...

AN UPPER LEVEL CYCLONIC CIRCULATION CENTER IS NEAR 32N49W.
A SECOND UPPER LEVEL CYCLONIC CENTER IS NEAR 29N68W. BROAD
CYCLONIC FLOW COVERS THE AREA THAT IS TO THE NORTH OF 26N
BETWEEN 41W AND 80W. BROAD UPPER LEVEL ANTICYCLONIC FLOW SPANS 
THE ATLANTIC OCEAN AND THE CARIBBEAN SEA FROM 10N TO 28N BETWEEN 
40W AND 80W. A 1015 MB LOW PRESSURE CENTER IS NEAR 28N50W.
A SURFACE TROUGH TRAILS FROM THE LOW CENTER TO 23N57W AND 20N68W.
ISOLATED MODERATE RAINSHOWERS ARE FROM 20N TO 33N BETWEEN 40W 
AND 50W. RAINSHOWERS ARE POSSIBLE FROM 15N TO 20N BETWEEN 64W 
AND 63W IN THE ATLANTIC OCEAN AND IN THE EASTERN CARIBBEAN SEA.
AN UPPER LEVEL CYCLONIC CIRCULATION CENTER IS NEAR 33N15W...
APPEARING TO BE PULLING ITSELF AWAY FROM THE MADEIRA 
ARCHIPELAGO. BROAD UPPER LEVEL CYCLONIC FLOW IS TO THE NORTH
OF 20N TO THE EAST OF 40W. A 1009 MB LOW PRESSURE CENTER IS NEAR
33N15W. BROAD SURFACE CYCLONIC FLOW IS TO THE NORTH OF THE 
CANARY ISLANDS TO THE EAST OF 20W. IT IS NOT EASY TO DISCERN ANY 
DEEP CONVECTIVE PRECIPITATION BASED SOLELY ON SATELLITE IMAGERY. 
A SURFACE RIDGE IS ALONG 35W...BETWEEN THE MADEIRA ARCHIPELAGO 
CYCLONIC CENTER AND THE FLOW THAT MOVES AROUND THE 1015 MB LOW 
CENTER THAT IS NEAR 28N50W.

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

$$
MT