000
AXNT20 KNHC 300616
TWDAT 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
205 AM EDT WED APR 30 2008

TROPICAL WEATHER DISCUSSION FOR NORTH AMERICA...CENTRAL 
AMERICA...THE GULF OF MEXICO...THE CARIBBEAN SEA...NORTHERN 
SECTIONS OF SOUTH AMERICA...AND THE 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY
THROUGH 0545 UTC.

...THE ITCZ...

4N1W 3N8W 3N14W 2N30W 3N40W 2S49W. SCATTERED TO NUMEROUS STRONG
SHOWERS AND THUNDERSTORMS ARE FROM 1N TO 3N BETWEEN 6W AND 8W...
FROM 5N TO 6N BETWEEN 14W AND 18W...FROM 3S TO THE EQUATOR 
BETWEEN 30W AND 33W...AND FROM 1S TO 2N BETWEEN 45W AND 48W.
ISOLATED MODERATE SHOWERS TO LOCALLY STRONG THUNDERSTORMS ARE
ELSEWHERE SOUTH OF 7N BETWEEN THE PRIME MERIDIAN AND 55W.
  
...DISCUSSION...

THE GULF OF MEXICO...THE ATLANTIC OCEAN WEST OF 70W...
AND THE NORTHWESTERN CORNER OF THE CARIBBEAN SEA...

THE MAIN BRANCH OF THE DEEP LAYER TROUGH THAT SUPPORTS THE
ATLANTIC OCEAN-TO-CUBA-TO NORTHWESTERN CARIBBEAN SEA COLD FRONT 
IS LIFTING TO THE NORTHEAST. ANOTHER SHOT OF A MIDDLE TO UPPER 
LEVEL TROUGH IS FILLING IN BEHIND THE MAIN PART OF THE TROUGH.
THE MIDDLE TO UPPER LEVEL TROUGH PASSES THROUGH GEORGIA/ALABAMA
INTO THE NORTHEASTERN CORNER OF THE GULF OF MEXICO. UPPER LEVEL
SOUTHWESTERLY WIND FLOW MOVES FROM THE SOUTHWESTERN CORNER OF 
THE GULF OF MEXICO TOWARD THE NORTHEASTERN CORNER. DEEP LAYER
MOISTURE...CLOUDS AND POSSIBLE SHOWERS...ACCOMPANIES THE 
FRONT...STRETCHING FROM BERMUDA TO THE NORTHERN HALF OF THE 
BAHAMAS TO THE YUCATAN PENINSULA AND SOUTHERN MEXICO...AND THE 
SOUTHWESTERN CORNER OF THE GULF OF MEXICO. MIDDLE TO UPPER LEVEL 
DRY AIR/SUBSIDENCE IS NORTHWEST OF THE MOISTURE BAND...NORTHWEST 
OF A LINE FROM LAKE OKEECHOBEE FLORIDA TO 22N90W TO 23N98W IN 
COASTAL MEXICO. A 1021 MB HIGH PRESSURE CENTER HAS DEVELOPED IN 
THE GULF OF MEXICO NEAR 28N91W. THE COLD FRONT PASSES THROUGH 
32N70W IN THE ATLANTIC OCEAN TO 25N76W IN THE BAHAMAS...CROSSING 
CUBA NEAR 22N80W TO 20N85W. A STATIONARY FRONT CONTINUES FROM 
20N85W TO 17N92W IN SOUTHERN MEXICO.
 
THE REST OF THE CARIBBEAN SEA...

AN UPPER LEVEL RIDGE PASSES THROUGH 10N60W TO NORTHERN COASTAL 
VENEZUELA AND COLOMBIA...CURVING TO 13N83W...AND NORTHEASTWARD 
TO HISPANIOLA. HIGH LEVEL CLOUDS ARE CURVING ANTICYCLONICALLY 
FROM THE SOUTHERN CARIBBEAN SEA NORTHWARD AS FAR AS JAMAICA AND 
THE WINDWARD PASSAGE. ISOLATED MODERATE SHOWERS AND STRONG
THUNDERSTORMS EXTEND FROM THE COLOMBIA BORDER WITH PANAMA TO 
WESTERN PANAMA.

THE REST OF THE ATLANTIC OCEAN...

AN UPPER LEVEL RIDGE IS ALONG 60W FROM 10N BEYOND 32N. 
ANTICYCLONIC FLOW COVERS THE ATLANTIC OCEAN NORTH OF 10N
BETWEEN 50W AND 70W. A CENTRAL ATLANTIC OCEAN DEEP LAYER TROUGH 
SUPPORTS A 998 MB LOW PRESSURE CENTER WITH GALE FORCE WINDS
NEAR 35N45W. A SURFACE TROUGH GOES FROM THE 35N45W LOW PRESSURE 
CENTER TO 32N44W 30N46W TO 27N51W. THE DEEP LAYER TROUGH EXTENDS 
FROM A CYCLONIC CIRCULATION CENTER NEAR 35N46W ON WATER VAPOR 
IMAGERY...TO 30N43W 26N42W AND 16N42W. AN UPPER LEVEL TROUGH
IS ALONG 10N28W TO 23N30W AND 28N30W TO 32N28W. A MIDDLE TO 
UPPER LEVEL CYCLONIC CIRCULATION CENTER HAS MOVED FROM 
MAURITANIA INTO WESTERN ALGERIA. A SURFACE TROUGH HAS DEVELOPED
FROM 32N30W TO 25N25W...CURVING TO A 1002 MB LOW PRESSURE CENTER 
NEAR 26N8W IN NORTHERN MAURITANIA. A SURFACE RIDGE IS ALONG
A LINE FROM 20N47W TO A 1020 MB HIGH PRESSURE CENTER NEAR
26N63W BEYOND 32N60W.

$$
MT