000 AXNT20 KNHC 210020 CCA TWDAT TROPICAL WEATHER DISCUSSION...COR NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL 805 PM EDT TUE APR 20 2010 CORRECTING DATE/TIME...AND UPDATING THE ITCZ SECTION AND THE ATLANTIC OCEAN SECTION... 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 2345 UTC... ...THE ITCZ... FROM SIERRA LEONE NEAR 8N13W TO 4N20W 1N30W 1N40W 1N50W. NUMEROUS STRONG SHOWERS AND THUNDERSTORMS FROM 2N TO 3N WITHIN 15 NM ON EITHER SIDE OF 9W...FROM 4N TO 6N BETWEEN 6W AND 8W...FROM THE EQUATOR TO 3N BETWEEN 37W AND 39W... IN BRAZIL FROM 2N TO 4N BETWEEN 50W AND 52W...AND IN BRAZIL FROM 2N TO 4N BETWEEN 54W AND 56W. WIDELY SCATTERED MODERATE SHOWERS TO ISOLATED STRONG THUNDERSTORMS ARE ELSEWHERE TO THE SOUTH OF 4N BETWEEN 20W AND 50W. ...DISCUSSION... THE GULF OF MEXICO... AN UPPER LEVEL RIDGE IS MOVING ACROSS WESTERN MEXICO FROM THE EASTERN PACIFIC OCEAN...ROUGHLY ALONG 110W. UPPER LEVEL WESTERN FLOW MOVES FROM INTERIOR MEXICO INTO THE WESTERN GULF OF MEXICO. THE WESTERN FLOW CONTINUES INTO A MIDDLE LEVEL TO UPPER LEVEL TROUGH THAT RUNS FROM 30N88W TO 24N93W TO 19N94W IN THE SOUTHWESTERN CORNER OF THE AREA. A SURFACE TROUGH PASSES THROUGH THE WESTERN FLORIDA PANHANDLE INTO SOUTHEASTERN LOUISIANA...TO SOUTH CENTRAL COASTAL LOUISIANA...INTO THE GULF OF MEXICO NEAR 26N94W TO COASTAL MEXICO NEAR 21N98W. SHOWERS ARE POSSIBLE FROM 20N TO 25N BETWEEN 90W AND 98W...BETWEEN 26N82W 22N88W AND 90W IN THE EASTERN GULF OF MEXICO. SHOWERS ARE POSSIBLE IN FLORIDA... RELATED TO A WEAK NORTH-TO-SOUTH ORIENTED TROUGH IN THE CENTER OF THE STATE. THE CARIBBEAN SEA... A SURFACE TROUGH EXTENDS FROM THE NORTH CENTRAL COAST OF THE DOMINICAN REPUBLIC TO SOUTHERN HAITI TO 17N74W...CURVING TO 12N78W. ISOLATED MODERATE SHOWERS HAVE DEVELOPED IN BROAD SURFACE LOW PRESSURE FROM INTERIOR AND COASTAL HONDURAS TO BELIZE TO THE CENTRAL YUCATAN PENINSULA. STRONG SHOWERS AND THUNDERSTORMS DEVELOPED IN COASTAL SECTIONS FROM NORTH CENTRAL AND NORTHWESTERN VENEZUELA TO NORTHEASTERN COLOMBIA...TO NORTHWESTERN COLOMBIA AND ITS BORDER WITH PANAMA...IN A BROAD AND WEAK SURFACE PRESSURE GRADIENT...AFTERNOON HEATING...AND UNDER UPPER LEVEL ANTICYCLONIC OUTFLOW. UPPER LEVEL SOUTHWESTERLY WIND FLOW COVERS THE EASTERN TWO-THIRDS OF THE AREA...BEING ON THE WESTERN SIDE OF UPPER LEVEL ANTICYCLONIC FLOW THAT COVERS THE ATLANTIC OCEAN TO AT LEAST 30W. THE ATLANTIC OCEAN... AN UPPER LEVEL TROUGH PASSES THROUGH 32N59W TO THE CENTRAL BAHAMAS. A COLD FRONT EXTENDS FROM A 1006 MB LOW PRESSURE CENTER THAT IS NEAR 31N54W TO 27N60W TO 25N69W TO 24N72W. A SURFACE TROUGH IS TO THE SOUTH OF THE FRONT ALONG 26N61W 24N64W 21N66W. WELL DEFINED UPPER LEVEL ANTICYCLONIC FLOW COVERS THE AREA BETWEEN THE 32N59W-BAHAMAS TROUGH AND THE EASTERN ATLANTIC OCEAN 31N17W 13N24W TROUGH. SHOWERS ARE POSSIBLE FROM 24N TO 26N BETWEEN 56W AND 57W. A TROUGH ON WATER VAPOR IMAGERY PASSES THROUGH 31N17W TO 27N20W TO 22N21W TO 13N24W. THIS TROUGH SUPPORTS AN EASTERN ATLANTIC OCEAN COLD FRONT THAT GOES FROM 33N11W TO THE EAST OF THE CANARY ISLANDS...TO 22N20W TO 18N30W AND 15N40W. A SHEAR AXIS/REMNANT CLOUD LINE CONTINUES FROM 15N40W TO 14N46W TO 17N54W. SHOWERS ARE POSSIBLE FROM 18N TO 20N BETWEEN AFRICA AND 20W...AND FROM THE SHEAR AXIS/REMNANT CLOUD LINE TO 18N BETWEEN 42W AND 52W. SURFACE ANTICYCLONIC FLOW COVERS THE ATLANTIC OCEAN TO THE NORTHWEST OF THE 33N11W 15N40W COLD FRONT...AROUND A 1018 MB HIGH PRESSURE CENTER THAT IS NEAR 27N37W. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ MT