[Tropical] Tropical Weather Discussion

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AXNT20 KNHC 271046
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT TUE APR 27 2010

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1015 UTC...

...THE ITCZ...

FROM THE LIBERIA COAST NEAR 7N10W TO 5N20W 2N30W...REACHING THE
EQUATOR ALONG 40W...CONTINUING ALONG THE BORDER BETWEEN 40W AND
47W...INTO THE NORTHEASTERN COAST OF BRAZIL NEAR 1N53W. STRONG
SHOWERS AND THUNDERSTORMS ARE IN THE COASTAL WATERS OF AFRICA
BETWEEN THE PRIME MERIDIAN AND 6W...OF LIBERIA AND SIERRA LEONE
FROM 4N TO 8N BETWEEN 9W AND 14W...WITHIN 30 NM ON EITHER SIDE
OF 3N47W 4N51W 5N53W IN NORTHERN FRENCH GUIANA...AND FROM GUYANA
TO VENEZUELA FROM 7N TO 11N BETWEEN 59W AND 62W. ISOLATED
MODERATE SHOWERS ARE ELSEWHERE TO THE SOUTH OF 7N IN THE
ATLANTIC OCEAN.

...DISCUSSION...

THE GULF OF MEXICO AND THE ATLANTIC OCEAN TO THE WEST OF 70W...
BROAD AND GENTLE UPPER LEVEL CYCLONIC FLOW COVERS THE AREA.
THE COLD FRONT THAT PASSES THROUGH 32N75W TO THE NORTHERN BAHAMAS
TO WESTERN CUBA IS SUPPORTED BY THE ASSOCIATED TROUGH AND UPPER
LEVEL CYCLONIC FLOW. THE COLD FRONT CONTINUES FROM WESTERN CUBA
TO THE EASTERN COAST OF THE YUCATAN PENINSULA NEAR 20N. SHOWERS
ARE TO THE SOUTH OF CUBA ALONG 21N BETWEEN 82W AND 83W.
A SURFACE TROUGH CONTINUES FROM NORTHEASTERN FLORIDA TO JUST
TO THE SOUTH OF THE FLORIDA BIG BEND...TO SOUTHEASTERN
LOUISIANA. A COLD FRONT NOW CUTS THROUGH CENTRAL LOUISIANA
TO COASTAL TEXAS...READY TO ENTER THE NORTHWESTERN WATERS OF
THE AREA. THIS FRONT ALSO IS SUPPORTED BY THE BROAD UPPER LEVEL
CYCLONIC FLOW. SURFACE ANTICYCLONIC FLOW COVERS MOST OF THE GULF
OF MEXICO...AROUND A 1013 MB HIGH PRESSURE CENTER THAT IS NEAR
26N91W.

THE CARIBBEAN SEA...
AN EAST-TO-WEST TROUGH GOES FROM EASTERN HONDURAS INTO WEST
CENTRAL GUATEMALA. BROAD UPPER LEVEL ANTICYCLONIC FLOW COVERS
THE AREA.  SCATTERED TO BROKEN HIGH CLOUDS COVER MOST OF THE
WESTERN TWO-THIRDS OF THE AREA. A SURFACE TROUGH IS IN THE
SOUTHWESTERN CORNER OF THE AREA...FROM 15N80W TO COLOMBIA NEAR
8N76W. THE SURFACE PRESSURE GRADIENT IS COMPARATIVELY WEAK. ONLY
THE
1012 MB ISOBAR MOVES FROM CENTRAL CUBA BEYOND THE SOUTHEASTERN
CARIBBEAN SEA ISLANDS. THE PRESSURE PATTERN IS FLAT FROM CUBA
TOWARD THE NORTHEASTERN COAST OF COLOMBIA AND NORTHWESTERN
COASTAL VENEZUELA.

THE ATLANTIC OCEAN TO THE EAST OF 70W...
AN UPPER LEVEL TROUGH PASSES THROUGH 33N37W TO 26N43W TO 14N47W
TO 12N58W. THE TROUGH SUPPORTS A FRONTAL BOUNDARY...COLD FROM
32N25W TO 26N30W...AND THEN STATIONARY FROM 26N30W TO 20N40W
AND 18N45W. NO PRECIPITATION IS READILY APPARENT JUST FROM
SATELLITE IMAGERY. SURFACE ANTICYCLONIC FLOW MOVES AROUND AN
EASTERN ATLANTIC OCEAN RIDGE THAT PASSES THROUGH 32N20W TO
23N29W TO 18N38W. SURFACE ANTICYCLONIC FLOW COVERS THE ATLANTIC
OCEAN TO THE NORTHWEST AND WEST OF THE STATIONARY FRONT...TO THE
EAST OF 70W...AROUND A 1024 MB HIGH PRESSURE CENTER THAT IS NEAR
30N45W.

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

$$
MT





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