[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 221755
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
205 PM EDT THU APR 22 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...

ITCZ AXIS IS CENTERED ALONG 8N13W 6N20W 2N30W 2N40W 1N50W.
SCATTERED MODERATE CONVECTION IS OFF THE COAST OF WEST AFRICA
FROM EQ-2N BETWEEN 6W-8W. SIMILAR CONVECTION IS FROM 7N-9N
BETWEEN 12W-15W. SCATTERED MODERATE TO ISOLATED STRONG
CONVECTION IS FROM EQ-3N BETWEEN 34W-44W. ISOLATED MODERATE
CONVECTION IS ALONG THE COAST OF SOUTH AMERICA FROM 3N-8N
BETWEEN 47W-51W.

...DISCUSSION...

THE GULF OF MEXICO...
AS OF 1500 UTC...A 1016 MB HIGH IS CENTERED OVER NORTH FLORIDA
NEAR 31N84W PRODUCING FAIR WEATHER AND LIGHT ANTICYCLONIC
SURFACE WINDS OVER THE NE GULF OF MEXICO. ELSEWHERE AN AREA OF
BROKEN TO OVERCAST MULTILAYERED CLOUDS ARE OVER S TEXAS AND THE
WESTERN GULF W OF 96W. IN THE UPPER LEVELS...AN UPPER LEVEL
RIDGE IS OVER THE GULF WITH AXIS ALONG 95W PRODUCING MOSTLY
WESTERLY FLOW. CONSIDERABLE UPPER LEVEL HIGH CLOUDS AND UPPER
LEVEL MOISTURE ARE OVER THE W GULF W OF 90W. STRONG SUBSIDENCE
IS OVER THE E GULF. EXPECT IN 24 HOURS... FOR A SURFACE LOW TO
BE OVER S TEXAS WITH SHOWERS. ALSO EXPECT SURFACE HIGH PRESSURE
RETURN FLOW TO BE OVER THE REMAINDER OF THE GULF WITH HIGHER
WINDS OVER THE W GULF DUE TO A STRONGER SURFACE PRESSURE
GRADIENT.

THE CARIBBEAN SEA...
FRESH TO STRONG TRADEWINDS ARE OVER THE CARIBBEAN SEA WITH
STRONGEST WINDS ALONG THE COASTS OF N COLOMBIA AND VENEZUELA. A
1008 MB LOW IS CENTERED OVER N COLOMBIA NEAR 7N73W. SCATTERED
SHOWERS ARE ALONG THE COAST OF N COLOMBIA...AND OVER THE LEEWARD
ISLANDS TO INCLUDE PUERTO RICO AND THE VIRGIN ISLANDS. MOSTLY
FAIR WEATHER IS OVER THE NW CARIBBEAN. IN THE UPPER LEVELS...AN
UPPER LEVEL RIDGE IS OVER THE CARIBBEAN WITH RIDGE AXIS ALONG
10N BETWEEN 60W-90W PRODUCING LIGHT ANTICYCLONIC UPPER LEVEL
WINDS. STRONG SUBSIDENCE IS OVER THE W CARIBBEAN W OF 76W.
CONSIDERABLE UPPER LEVEL MOISTURE AND HIGH CLOUDS ARE OVER THE
REMAINDER OF THE CARIBBEAN. EXPECT LITTLE CHANGE OVER THE NEXT
24 HOURS.

THE ATLANTIC OCEAN...
A FORMING COLD FRONT IS OVER THE W ATLANTIC ALONG 32N72W 30N77W.
A PREFRONTAL TROUGH IS ALONG 31N70W 28N78W. ISOLATED SHOWERS ARE
FROM 28N-30N BETWEEN 73W-77W. A 1014 MB HIGH IS FURTHER NE NEAR
35N58W. A 1012 MB LOW IS CENTERED N OF THE LEEWARD ISLANDS NEAR
26N62W. A SURFACE TROUGH EXTENDS S FROM THE LOW TO NEAR PUERTO
RICO. A STATIONARY FRONT ALSO EXTENDS E FROM THE LOW TO 25N46W.
SCATTERED SHOWERS ARE WITHIN 90 NM OF THE FRONT. A COLD FRONT IS
OVER THE CENTRAL ATLANTIC FROM 32N33W TO 25N46W. SCATTERED
SHOWERS ARE WITHIN 45 NM OF THE FRONT. FURTHER E...A 1020 MB
HIGH IS CENTERED OVER THE E ATLANTIC NEAR 26N27W PRODUCING FAIR
WEATHER OVER THE CANARY ISLANDS. IN THE UPPER LEVELS...AN UPPER
LEVEL TROUGH IS OVER THE W ATLANTIC N OF 20N W OF 55W. A LARGE
UPPER LEVEL HIGH IS CENTERED E OF TRINIDAD NEAR 12N50W.
ANTICYCLONIC FLOW IS S OF 20N W OF 30W. AN UPPER LEVEL TROUGH IS
OVER THE E ATLANTIC AND W AFRICA N OF THE EQUATOR E OF 30W.
EXPECT IN 24 HOURS FOR THE TWO FRONTS TO MOVE E WITH SHOWERS.

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

$$
FORMOSA







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