000
AXNT20 KNHC 041715
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
205 PM EDT SUN APR 04 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 1645 UTC...

...THE ITCZ...

FROM THE SIERRA LEONE COAST NEAR 8N13W TO 4N20W 2N30W 
1N40W...CROSSING THE EQUATOR ALONG 45W...INTO NORTHEASTERN 
BRAZIL NEAR 1S50W. SCATTERED STRONG SHOWERS AND THUNDERSTORMS 
FROM 3N TO 5N BETWEEN 17W AND 19W...FROM 2N TO 4N BETWEEN 31W 
AND 35W. ISOLATED MODERATE SHOWERS AND POSSIBLE THUNDERSTORMS 
ARE ELSEWHERE TO THE SOUTH OF 7N.

...DISCUSSION...

THE GULF OF MEXICO...
AN UPPER LEVEL RIDGE IS ON TOP OF MEXICO ALONG 101W/102W TO THE 
SOUTH OF 25N. BROAD UPPER LEVEL WESTERLY WIND FLOW AND DRY AIR 
IN SUBSIDENCE COVER THE GULF OF MEXICO. UPPER LEVEL MOISTURE
IS MOVING ACROSS FLORIDA TO THE NORTH OF 29N BETWEEN 78W AND 
86W. BROAD SURFACE ANTICYCLONIC FLOW COVERS THE AREA. A SURFACE 
RIDGE EXTENDS FROM A 1023 MB HIGH PRESSURE CENTER THAT IS NEAR 
32N74W TO THE CENTRAL BAHAMAS NEAR 24N75W TO THE SOUTH CENTRAL 
DOMINICAN REPUBLIC.

THE CARIBBEAN SEA...
DEEP LAYER CYCLONIC FLOW COVERS THE ATLANTIC OCEAN TO THE WEST 
OF A 32N36W 26N33W 8N35W UPPER LEVEL RIDGE. THE CYCLONIC FLOW 
PUSHES RIGHT UP AGAINST THE CARIBBEAN SEA BASIN. A TROUGH ON 
WATER VAPOR IMAGERY PASSES THROUGH 26N58W TO THE MONA PASSAGE.
THE SOUTHWESTERNMOST POINT OF A DISSIPATING STATIONARY FRONT 
TOUCHES THE ISLAND OF DOMINICA IN THE EASTERN CARIBBEAN SEA.
A REMNANT CLOUD LINE IS ALONG 20N55W 17N60W 16N65W 15N72W. 
SHOWERS ARE POSSIBLE WITHIN 60 NM ON EITHER SIDE OF THE REMNANT 
CLOUD LINE...AND WITHIN 30 NM TO 60 NM ON EITHER SIDE OF 18N74W
15N80W 14N83W AT THE NICARAGUA COAST. BROAD UPPER LEVEL WESTERLY 
FLOW COVERS THE AREA. UPPER LEVEL SOUTHWESTERLY WIND FLOW MOVES
FROM THE EASTERN PACIFIC OCEAN AND NORTHERN SECTIONS OF SOUTH 
AMERICA ACROSS THE AREA...TO THE SOUTH OF 16N.

THE ATLANTIC OCEAN...
AN UPPER LEVEL RIDGE PASSES THROUGH 32N36W TO 26N33W 18N34W TO
8N35W. THE TROUGH THAT SPANNED MOROCCO...THE WESTERN SAHARA...
AND WESTERN MAURITANIA HAS MOVED TO THE EAST IN AFRICA EVEN 
MORE. DEEP LAYER CYCLONIC FLOW COVERS THE AREA FROM THE 32N36W 
8N35W RIDGE TO 70W. A TROUGH GOES FROM A 32N55W CYCLONIC 
CIRCULATION CENTER TO 26N58W TO THE MONA PASSAGE. THE TROUGH 
SUPPORTS THE COLD FRONT THAT PASSES THROUGH 32N43W TO 30N43W
25N46W 22N50W 19N55W. A DISSIPATING STATIONARY FRONT CONTINUES 
FROM 19N55W TO THE ISLAND OF DOMINICA IN THE EASTERN CARIBBEAN 
SEA. A REMNANT CLOUD LINE IS ALONG 20N55W 17N60W 16N65W 15N72W.
SURFACE ANTICYCLONIC FLOW IS TO THE NORTH OF 24N TO THE EAST OF 
40W. SHOWERS AND THUNDERSTORMS ARE POSSIBLE TO THE NORTH OF 25N
BETWEEN 39W AND 44W. SHOWERS ARE POSSIBLE FROM 19N TO 25N 
BETWEEN 44W AND 52W. SHOWERS ARE POSSIBLE WITHIN 60 NM TO 90 NM 
ON EITHER SIDE OF THE REMNANT CLOUD LINE. A SURFACE RIDGE 
EXTENDS FROM A 1023 MB HIGH PRESSURE CENTER THAT IS NEAR 32N74W 
TO THE CENTRAL BAHAMAS NEAR 24N75W TO THE SOUTH CENTRAL 
DOMINICAN REPUBLIC. SURFACE ANTICYCLONIC FLOW IS TO THE NORTH
OF 24N TO THE EAST OF 40W.

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

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MT