[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 121121
TWDAT

TROPICAL WEATHER DISCUSSION
NWS NATIONAL HURRICANE CENTER MIAMI FL
705 AM EST SAT JAN 12 2013

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...WEATHER OBSERVATIONS...RADAR...AND METEOROLOGICAL
ANALYSIS.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH
1115 UTC.

...ITCZ/MONSOON TROUGH...

THE MONSOON TROUGH EXTENDS FROM THE COAST OF LIBERIA NEAR 6N10W
TO 4N14W. THE INTERTROPICAL CONVERGENCE ZONE AXIS EXTENDS FROM
4N14W TO 3N20W TO 4N30W TO 3N40W TO THE COAST OF BRAZIL NEAR
0N48W. ISOLATED MODERATE CONVECTION IS FROM 1N-6N BETWEEN
32W-44W.

...DISCUSSION...

GULF OF MEXICO...
A 1025 MB HIGH IS CENTERED OVER THE W ATLANTIC NEAR 32N72W. A
SURFACE RIDGE AXIS EXTENDS W FROM THE HIGH ALONG 30N TO E TEXAS.
10-15 KT SE WINDS ARE THUS OVER THE GULF OF MEXICO WITH RETURN
FLOW. RADAR IMAGERY SHOWS THE GULF IS VOID OF PRECIPITATION.
SCATTERED SHOWERS ARE HOWEVER INLAND OVER THE FLORIDA PANHANDLE.
IN THE UPPER LEVELS...AN UPPER LEVEL RIDGE IS OVER THE W GULF W
OF 90W. AN UPPER LEVEL TROUGH IS OVER THE E GULF WITH A SMALL
EMBEDDED UPPER LEVEL LOW CENTERED OVER N FLORIDA NEAR 29N83W.
STRONG SUBSIDENCE IS OVER THE GULF...WHILE TEXAS AND THE OTHER
GULF STATES HAVE SCATTERED TO BROKEN HIGH CLOUDS AND UPPER LEVEL
MOISTURE. EXPECT IN 24 HOURS FOR A COLD FRONT TO BE ALONG THE S
TEXAS WITH CONVECTION...MOVING SE.

CARIBBEAN SEA...
A 1006 MB LOW IS CENTERED OVER N COLOMBIA NEAR 6N74W. THE
SURFACE PRESSURE GRADIENT BETWEEN THIS LOW AND THE W ATLANTIC
HIGH IS PRODUCING 15-30 KT TRADEWINDS OVER THE CARIBBEAN SEA
WITH STRONGEST WINDS ALONG THE COAST OF N COLOMBIA. SCATTERED
SHOWERS ARE OVER THE NW CARIBBEAN N OF 14N BETWEEN 80W-87W. MORE
SHOWERS ARE OVER HISPANIOLA...PUERTO RICO...AND THE E CARIBBEAN
E OF 72W. IN THE UPPER LEVELS...AN UPPER LEVEL RIDGE IS OVER THE
CARIBBEAN SEA WITH AXIS ALONG 77W. STRONG SUBSIDENCE IS OVER THE
ENTIRE CARIBBEAN AND CENTRAL AMERICA SUPPRESSING ALL DEEP
CONVECTION. EXPECT LITTLE CHANGE OVER THE NEXT 24 HOURS.

ATLANTIC OCEAN...
A 1025 MB HIGH IS CENTERED OVER THE W ATLANTIC NEAR 32N72W
PRODUCING FAIR WEATHER. A COLD FRONT IS OVER THE CENTRAL
ATLANTIC FROM 32N38W TO 28N40W TO 19N50W. A GALE IS N OF 28N W
OF FRONT TO 55W. SCATTERED MODERATE CONVECTION IS WITHIN 120 NM
E OF THE FRONT N OF 28N. A 1026 MB HIGH IS OVER MOROCCO NEAR
33N4W. A SURFACE RIDGE AXIS EXTENDS SW FROM THE HIGH TO 24N25W.
IN THE UPPER LEVELS...A VERY LARGE UPPER LEVEL LOW IS CENTERED
OVER THE CENTRAL ATLANTIC NEAR 38N50W SUPPORTING THE CENTRAL
ATLANTIC COLD FRONT. EXPECT THE COLD FRONT TO MOVE 600 NM E OVER
THE NEXT 24 HOURS WITH CONVECTION.

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

$$
FORMOSA





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