000
AXNT20 KNHC 280757 CCA
TWDAT 

TROPICAL WEATHER DISCUSSION...COR
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
205 AM EDT FRI MAY 28 2010

CORRECTION IN ORDER TO CORRECT THE CARIBBEAN SEA SECTION
AND TO MODIFY THE ATLANTIC OCEAN SECTION

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...METEOROLOGICAL ANALYSIS...WEATHER 
OBSERVATIONS...AND RADAR.

BASED ON 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0715 UTC...

...TROPICAL WAVES...

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 27W TO THE SOUTH OF 
9N MOVING WESTWARD 10 KT. THIS WAVE IS NOT EASY TO DISCERN IN 
THE SATELLITE IMAGERY. ANY NEARBY PRECIPITATION IS PART OF THE 
ITCZ PRECIPITATION.

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 33W TO THE SOUTH OF 9N 
MOVING WEST 10 KT. THIS WAVE IS NOT EASY TO DISCERN IN THE 
SATELLITE IMAGERY. ANY NEARBY PRECIPITATION IS PART OF THE
ITCZ PRECIPITATION.

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 45W/46W TO THE SOUTH OF 
10N MOVING WESTWARD 10 KT. THIS WAVE IS NOT EASY TO DISCERN IN 
THE SATELLITE IMAGERY. IT IS NOT CERTAIN IF THE STRONG SHOWERS 
THAT ARE IN TWO CLUSTERS FROM 6N TO 7N BETWEEN 47W AND 50W ARE
OR ARE NOT ACCOMPANYING THIS WAVE.

AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 55W/56W TO THE SOUTH OF
10N MOVING WESTWARD 10 KT. THIS WAVE EVENTUALLY PASSES THROUGH 
SURINAME. STRONG SHOWERS AND THUNDERSTORMS IN A FEW CLUSTERS ARE
IN BRAZIL FROM 1S TO 2N BETWEEN 57W AND 59W.

A CARIBBEAN SEA TROPICAL WAVE IS ALONG ALONG 75W TO THE SOUTH OF 
13N INTO COLOMBIA...MOVING WESTWARD 10 KT. IT IS NOT EASY TO FIND
ANY PRECIPITATION THAT IS DIRECTLY RELATED ONLY TO THIS WAVE.
 
...THE ITCZ...

FROM THE GUINEA COAST NEAR 10N14W TO 5N26W TO 4N40W...TO FRENCH
GUIANA NEAR 5N53W. WIDELY SCATTERED MODERATE SHOWERS TO LOCALLY 
STRONG THUNDERSTORMS ARE WITHIN 90 NM ON EITHER SIDE OF 7N12W
AT THE COAST OF SIERRA LEONE...TO 4N27W 5N41W 8N52W 11N59W.

...DISCUSSION...

THE GULF OF MEXICO...
RESULTING MIDDLE LEVEL TO UPPER LEVEL CYCLONIC FLOW COVERS THE 
AREA...FROM THE NORTHEASTERN CORNER TO THE SOUTHWESTERN CORNER.
THIS CYCLONIC FLOW NOW IS SOMEWHAT IN PHASE WITH THE BROAD 
MIDDLE LEVEL TO UPPER LEVEL CYCLONIC FLOW THAT HAS BEEN IN PLACE 
IN THE WESTERN ATLANTIC OCEAN FOR AT LEAST THE LAST 5 DAYS.
THE WESTERN ATLANTIC CYCLONIC FLOW HAS BEEN RELATED TO A SURFACE
LOW PRESSURE CENTER THAT HAS REMAINED ALONG 30N/31N BETWEEN
70W AND 78W FOR THE LAST 5 DAYS. THE SURFACE PRESSURE PATTERN
ALONG AND TO THE EAST OF 89W IS WEAK. SURFACE ANTICYCLONIC FLOW
TO THE WEST OF 89W MOVES AROUND A NORTHWESTERN CORNER 1014 MB 
HIGH PRESSURE CENTER THAT IS NEAR 27N96W.

THE CARIBBEAN SEA...
UPPER LEVEL ANTICYCLONIC FLOW MOVES FROM THE PART OF THE EASTERN 
PACIFIC OCEAN THAT IS TO THE SOUTH OF MEXICO AND CENTRAL AMERICA 
BETWEEN 80W AND 105W...INTO THE GULF OF MEXICO TO THE SOUTH OF 
23N...THROUGH THE YUCATAN CHANNEL...TOWARD HISPANIOLA. A SURFACE 
TROUGH RUNS FROM CENTRAL HONDURAS TO 20N80W. SCATTERED MODERATE 
SHOWERS TO ISOLATED STRONG THUNDERSTORMS ARE FROM 14N TO 17N 
BETWEEN 78W AND 82W. SHOWERS ARE POSSIBLE FROM JAMAICA TO 
SOUTHEASTERN CUBA. A CARIBBEAN SEA TROPICAL WAVE IS ALONG 75W TO 
THE SOUTH OF 13N INTO COLOMBIA...MOVING WESTWARD 10 KT. IT IS 
NOT EASY TO FIND ANY PRECIPITATION THAT IS DIRECTLY RELATED ONLY 
TO THIS WAVE.

THE ATLANTIC OCEAN...
DEEP LAYER CYCLONIC FLOW ASSOCIATED WITH A BROAD TROUGH COVERS 
THE AREAS OF THE WESTERN ATLANTIC OCEAN FROM 20N AND THE BAHAMAS
NORTHWARD TO THE WEST OF 60W. IT IS POSSIBLE THAT THE PART OF 
THE TROUGH THAT WAS EXTENDING INTO THE SOUTHERN CARIBBEAN SEA 
DURING THE LAST 5 DAYS HAS DISSIPATED. A 1005 MB LOW PRESSURE 
CENTER IS NEAR 30N72W. A SURFACE TROUGH EXTENDS FROM THE 1005 MB 
LOW CENTER TO 26N77W IN THE NORTHERN BAHAMAS...AND TO THE 
SOUTHEASTERN FLORIDA COAST NEAR 25N. SHOWERS AND THUNDERSTORMS 
SURROUND THE LOW CENTER TO THE NORTH OF 27N BETWEEN 65W AND 77W. 
OTHER SHOWERS ARE WITHIN 60 NM ON EITHER SIDE OF 28N60W 23N70W 
22N75W. AN UPPER LEVEL TROUGH GOES FROM A 27N29W CYCLONIC 
CIRCULATION CENTER TO 20N32W TO 15N35W AND 9N47W.
NO PRECIPITATION IS DISCERNIBLE WITH THIS TROUGH. BROAD SURFACE 
ANTICYCLONIC FLOW COVERS THE AREA TO THE NORTH OF 10N BETWEEN 
AFRICA AND 60W. THIS FLOW MOVES AROUND A 1022 MB HIGH PRESSURE 
CENTER THAT IS NEAR 30N25W.

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

$$
MT