000
AXNT20 KNHC 201724
TWDAT 

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL  
205 PM EDT TUE APR 20 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 1715 UTC...

...THE ITCZ...

THE ITCZ IS CENTERED ALONG 7N12W 4N20W 1N40W 1N50W. SCATTERED 
MODERATE TO STRONG CONVECTION IS ALONG THE COAST OF WEST AFRICA 
FROM 2S-5N BETWEEN THE PRIME MERIDIAN AND 8W. CLUSTERS OF 
SCATTERED MODERATE TO ISOLATED STRONG CONVECTION ARE FURTHER W 
FROM 4N-7N BETWEEN 10W-13W. SCATTERED MODERATE CONVECTION IS 
FROM 2S-4S BETWEEN 27W-31W...AND FROM 3S-2N BETWEEN 32W-39W. 
SCATTERED MODERATE CONVECTION IS ALSO ALONG THE COAST OF BRAZIL 
FROM EQ-3S BETWEEN 41W-45W...AND EQ-3N BETWEEN 45W-51W.  

...DISCUSSION...

THE GULF OF MEXICO...
A 1014 MB LOW IS CENTERED OVER CENTRAL ALABAMA NEAR 34N87W. A 
SURFACE TROUGH EXTENDS S FROM THE LOW TO THE NW GULF OF MEXICO 
ALONG 30N86W 27N90W 25N97W. SCATTERED SHOWERS ARE WITHIN 90 NM 
OF THE TROUGH. FURTHER E...HIGH PRESSURE RIDGING REMAINS OVER 
FLORIDA AND THE SE GULF WITH FAIR WEATHER AND LIGHT SE WINDS.   
IN THE UPPER LEVELS... THE BASE OF AN UPPER LEVEL TROUGH IS OVER 
THE GULF PRODUCING MOSTLY WESTERLY FLOW. CONSIDERABLE UPPER 
LEVEL MOISTURE AND CLOUDINESS IS OVER THE N GULF N OF 26N. THE 
REMAINDER OF THE AREA HAS STRONG SUBSIDENCE. EXPECT IN 24 HOURS 
... FOR THE TROUGH TO MOVE E AND EXTEND FROM CENTRAL FLORIDA TO 
THE SE GULF ALONG 30N80W 24N86W WITH SHOWERS.

THE CARIBBEAN SEA...
A SURFACE TROUGH EXTENDS FROM HISPANIOLA TO PANAMA ALONG 20N70W 
9N78W. SURFACE WINDS W OF THE TROUGH ARE 5-10 KT FROM THE NE. 
THE REMAINDER OF THE CARIBBEAN HAS 10-20 KT TRADEWINDS. A 1006 
MB LOW IS CENTERED OVER N COLOMBIA NEAR 6N71W. SCATTERED 
MODERATE CONVECTION IS INLAND OVER N COLOMBIA FROM 10N-12N 
BETWEEN 72W-76W. SCATTERED SHOWERS ARE ALSO OVER PANAMA. 
ELSEWHERE...RADAR IMAGERY SHOWS SCATTERED SHOWERS OVER PUERTO 
RICO AND THE VIRGIN ISLANDS. IN THE UPPER LEVELS...ZONAL FLOW IS 
OVER THE W CARIBBEAN W OF 80W. AN UPPER LEVEL RIDGE IS OVER 
THE REMAINDER OF THE CARIBBEAN E OF 80W. THE RESULTANT UPPER 
LEVEL WIND FLOW E OF 80W IS THUS FROM THE SW. STRONG SUBSIDENCE 
IS OVER THE NW AND SE CARIBBEAN. CONSIDERABLE UPPER LEVEL 
MOISTURE AND HIGH CLOUDS ARE OVER THE REMAINDER OF THE CENTRAL 
CARIBBEAN. EXPECT LITTLE CHANGE OVER THE NEXT 24 HOURS.

THE ATLANTIC OCEAN...
A 1006 MB LOW IS CENTERED OVER THE W ATLANTIC NEAR 30N58W MOVING 
NE. A COLD FRONT EXTENDS SW FROM THE LOW TO THE CENTRAL BAHAMAS. 
SCATTERED SHOWERS ARE E OF THE FRONT FROM 25N-30N BETWEEN 
53W-60W. A 1018 MB HIGH IS OVER THE CENTRAL ATLANTIC NEAR 27N40W 
PRODUCING LIGHT WINDS AND FAIR WEATHER. A COLD FRONT IS OVER THE 
E ATLANTIC FROM 32N14W TO 23N20W 15N40W. SCATTERED SHOWERS ARE 
OVER THE CANARY ISLANDS. IN THE UPPER LEVELS...A LARGE UPPER 
LEVEL HIGH IS CENTERED NEAR 11N50W. ANTICYCLONIC FLOW IS BETWEEN 
30W-70W. AN UPPER LEVEL TROUGH IS OVER THE E ATLANTIC AND W 
AFRICA N OF 10N E OF 30W. EXPECT IN 24 HOURS FOR THE TWO FRONTAL 
SYSTEMS TO MOVE E WITH SHOWERS.       

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

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FORMOSA