[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 192335
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
705 PM EST FRI DEC 19 2008

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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
2315 UTC.

...THE ITCZ...
ITCZ IS CENTERED ALONG 8N13W 6N35W 3N45W 2N50W. SCATTERED
MODERATE CONVECTION IS FROM 3N-6N BETWEEN 21W-24W. SCATTERED
MODERATE/ISOLATED STRONG CONVECTION IS FROM 1N-9N BETWEEN
28W-38W.

...DISCUSSION...

GULF OF MEXICO...
AS OF 2100 UTC...A 1023 MB HIGH IS CENTERED OVER THE NE GULF OF
MEXICO NEAR 28N84W. 10-15 KT ANTICYCLONIC WINDS COVERS THE
ENTIRE GULF OF MEXICO. PATCHES OF BROKEN LOW CLOUDS DOTS THE
GULF WITH NO PRECIPITATION. THE TEXAS COAST FROM HOUSTON TO
BROWNSVILLE HAS BROKEN TO OVERCAST LOW CLOUDS EXTENDING 90 NM
INLAND. IN THE UPPER LEVELS...AN UPPER LEVEL HIGH IS CENTERED
OVER TAMPICO MEXICO NEAR 22N98W. ANOTHER UPPER LEVEL HIGH IS
CENTERED OVER THE E GULF NEAR 25N84W. STRONG SUBSIDENCE COVERS
THE ENTIRE GULF. EXPECT VERY LITTLE CHANGE OVER THE NEXT 24
HOURS WITH CONTINUED MOSTLY FAIR WEATHER.

CARIBBEAN SEA...
FRESH TO STRONG TRADEWINDS ARE OVER THE CARIBBEAN SEA WITH THE
STRONGEST WINDS ALONG THE COAST OF N COLOMBIA. HARDILY ANY
CONVECTION IS NOTED EXCEPT E OF TRINIDAD WHERE ISOLATED
MODERATE CONVECTION IS FROM 10N-12N BETWEEN 58W-60W. SCATTERED
SHOWERS ARE OVER THE HIGHER ELEVATIONS OF PUERTO RICO...
HISPANIOLA....JAMAICA...AND CUBA DUE TO NORTHEASTERLY FLOW.
SCATTERED SHOWERS ARE ALSO OVER THE SW CARIBBEAN ALONG THE
COASTS OF PANAMA...COSTA RICA...AND NICARAGUA FROM 8N-15N
BETWEEN 81W-87W. IN THE UPPER LEVELS...A RIDGE IS OVER THE
CENTRAL CARIBBEAN ALONG 75W. STRONG SUBSIDENCE COVERS THE ENTIRE
SEA AND CENTRAL AMERICA. EXPECT...LITTLE CHANGE OVER THE NEXT 24
HOURS.

ATLANTIC OCEAN...
A 1024 MB HIGH IS OVER THE W ATLANTIC NEAR 30N72W PRODUCING
MOSTLY FAIR WEATHER. A SURFACE TROUGH IS OVER THE CENTRAL
ATLANTIC ALONG 57W FROM 31N-25N. ANOTHER TROUGH IS N OF THE
LEEWARD ISLANDS FROM 24N60W TO 18N63W. ALONG BETWEEN THE TWO LOW
CENTERS. A 1034 MB HIGH IS OVER THE E ATLANTIC W OF SPAIN AT
44N13W. A RIDGE AXIS EXTENDS SW FROM THE HIGH TO THE CENTRAL
ATLANTIC NEAR 28N43W. IN THE UPPER LEVELS...A RIDGE IS OVER THE
W ATLANTIC W OF 65W. A TROUGH IS OVER THE CENTRAL ATLANTIC N OF
20N BETWEEN 45W-65W. A RIDGE IS OVER THE E ATLANTIC NO F 20N
BETWEEN 25W-45W. AN UPPER LEVEL LOW IS OVER THE THE CANARY
ISLANDS NEAR 30N17W. ZONAL FLOW IS OVER THE TROPICS FROM 10N-20N
BETWEEN 60W-20W.

$$
FORMOSA




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