[Tropical] Tropical Weather Discussion

[EMWIN Server]

AXNT20 KNHC 201050
TWDAT

TROPICAL WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
805 AM EDT FRI MAR 20 2009

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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH THROUGH 1015 UTC.

...ITCZ...
FROM 5N9W TO 1N20W...CROSSING THE EQUATOR ALONG 29W...INTO
NORTHEASTERN BRAZIL NEAR 3S46W. ISOLATED AND DISORGANIZED
MODERATE SHOWERS ARE SOUTH OF THE LINE FROM 6N AT THE LIBERIA
COAST...TO 3N33W 3N45W 10N60W.

...DISCUSSION...

THE GULF OF MEXICO...
THE SOUTHWESTERN END OF A DEEP LAYER TROUGH REACHES CUBA AND
THE STRAITS OF FLORIDA. MIDDLE TO UPPER LEVEL NORTHWESTERLY-
TO-WESTERLY WIND FLOW COVERS THE AREA. A SURFACE TROUGH THAT
HAS BEEN ON THE MAPS FOR THE LAST 48 HOURS OR SO IS ALONG 20N88W
IN THE NORTHERN YUCATAN PENINSULA TO 27N91W IN THE NORTH CENTRAL
GULF OF MEXICO. ISOLATED AND DISORGANIZED MODERATE SHOWERS ARE
FROM 24N TO 26N BETWEEN 85W AND 94W. WEAK AND DISORGANIZED
PRECIPITATION IS DISSIPATING IN THE EASTERN YUCATAN PENINSULA.
CONVECTIVE DEBRIS CLOUDS HAVE SPILLED OVER INTO THE WATERS
OF THE NORTHWESTERN CARIBBEAN SEA FROM 18N TO 21N WEST OF 85W.

THE CARIBBEAN SEA...
A BIT OF DEEP LAYER CYCLONIC FLOW FROM THE ATLANTIC OCEAN
TO STRAITS OF FLORIDA TROUGH REACH CUBA AND A SMALL PART OF THE
NORTHWESTERN CORNER OF THE AREA NORTH OF 20N. MIDDLE TO UPPER
LEVEL WEST-TO-SOUTHWEST WIND FLOW COVERS THE REST OF THE AREA.
MIDDLE TO UPPER LEVEL DRY AIR IN SUBSIDENCE IS EVERYWHERE...
EXCEPT FOR THE PART TO THE SOUTHEAST OF THE LINE FROM DOMINICA
TO THE PENINSULA DE LA GUAJIRA OF NORTHEASTERN COLOMBIA.

THE ATLANTIC OCEAN...
A DEEP LAYER TROUGH PASSES THROUGH 34N45W TO 29N49W TO
A CYCLONIC CIRCULATION CENTER NEAR 28N72W TO THE CUBA COAST
ALONG 80W. THIS TROUGH SUPPORTS A 998 MB STORM CENTER THAT
IS NEAR 37N43W. A COLD FRONT CONNECTED TO THIS STORM CENTER
PASSES THROUGH 32N40W TO 25N50W TO 23N60W. A WARM FRONT
CONTINUES FROM 23N60W TO 26N68W TO A 1013 MB LOW PRESSURE CENTER
NEAR 26N74W. BROAD SURFACE LOW PRESSURE COVERS THE AREA NORTH
OF 20N BETWEEN 65W AND THE BAHAMAS. A DEEP LAYER TROUGH PASSES
THROUGH 32N14W JUST TO THE EAST OF THE MADEIRA ARCHIPELAGO...
ACROSS THE CANARY ISLANDS TO 24N18W TO 12N20W SOUTHEAST OF
THE CAPE VERDE ISLANDS TO 8N22W. THIS TROUGH SUPPORTS THE
DISSIPATING COLD FRONT THAT EXTENDS FROM A 1013 MB LOW PRESSURE
CENTER NEAR 32N13W TO THE MOROCCO COAST NEAR 26N15W TO 22N20W
21N30W 24N36W. BROKEN TO OVERCAST LOW AND MIDDLE LEVEL CLOUDS
ARE TO THE NORTH AND NORTHWEST OF THIS BOUNDARY.

$$
MT



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