000 AXNT20 KNHC 132356 TWDAT TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 805 PM EDT SAT APR 13 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 1800 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 2315 UTC. ...THE ITCZ/THE MONSOON TROUGH... THE MONSOON TROUGH PASSES THROUGH COASTAL GUINEA... JUST AWAY FROM THE BORDER WITH SIERRA LEONE NEAR 9N13W...TO 2N20W...CROSSING THE EQUATOR ALONG 23W... TO 1S24W. THE ITCZ CONTINUES FROM 1S24W TO 1S28W... TO 34W FROM THE EQUATOR TO 1S...TO 1S40W AND THE BRAZIL COAST NEAR 3S44W. CONVECTIVE PRECIPITATION... SCATTERED STRONG FROM THE EQUATOR TO 3N BETWEEN 5W AND 10W...FROM 3N TO 6N BETWEEN 11W AND 17W... WITHIN A 30 NM RADIUS OF 1N40W...AND FROM 4N TO 5N BETWEEN 50W AND 51W. SCATTERED MODERATE TO STRONG FROM THE EQUATOR TO 2N BETWEEN 20W AND 25W. ...DISCUSSION... FROM THE WESTERN ATLANTIC OCEAN INTO THE GULF OF MEXICO... A MIDDLE LEVEL TO UPPER LEVEL TROUGH IS WELL INLAND. CYCLONIC WIND FLOW AROUND THE TROUGH COVERS THE NORTHEASTERN QUADRANT OF THE U.S.A. MIDDLE LEVEL TO UPPER LEVEL SOUTHWESTERLY WIND FLOW COVERS THE GULF OF MEXICO. THE INLAND TROUGH SUPPORTS THE CURRENT COLD FRONT THAT PASSES THROUGH 32N75W IN THE ATLANTIC OCEAN...TO THE SOUTHEASTERN COAST OF FLORIDA THAT NEAR IS NEAR 27N...ALONG THE COAST TO THE FLORIDA KEYS AND CURVING TO 25N83W IN THE SOUTHEASTERN GULF OF MEXICO. THE FRONT BECOMES STATIONARY FROM 25N83W TO 27N91W 25N94W...AND TO THE NORTHEASTERN COAST OF MEXICO... JUST TO THE SOUTH OF THE TEXAS BORDER...NEAR 25N98W. CONVECTIVE PRECIPITATION...SCATTERED MODERATE TO ISOLATED STRONG IN THE ATLANTIC OCEAN WITHIN 75 NM ON EITHER SIDE OF 32N73W 29N76W 26N78W IN THE NORTHERN BAHAMAS...AND IN THE CENTRAL GULF OF MEXICO FROM 26N TO 27N BETWEEN 89W AND 90W. RAINSHOWERS ARE POSSIBLE ALONG THE SOUTHEASTERN FLORIDA COAST FROM 26N TO 27N BETWEEN 80W AND 81W...AND FROM IN THE GULF OF MEXICO FROM 28N TO 30N BETWEEN 85W AND 89W. THE REST OF THE GULF OF MEXICO... LOW CLOUD AND MIDDLE LEVEL CLOUD CEILINGS COVER THE DEEP SOUTH OF TEXAS...AND ALONG THE MIDDLE TEXAS GULF COAST. HIGH LEVEL CLOUD CEILINGS ARE BEING OBSERVED IN THE HOUSTON METROPOLITAN AREA. THE CEILINGS ARE BREAKING UP AND BECOMING SCATTERED LOW LEVEL CLOUD AND MIDDLE LEVEL CLOUDS AS ONE MOVES NORTHWARD TO THE UPPER TEXAS GULF COAST. LOW CLOUD CEILINGS AT 200 FEET AT PATTERSON LOUISIANA JUST STARTED TO BECOME SCATTERED IN THE LAST OBSERVATION. A MIXTURE OF SCATTERED TO BROKEN MIDDLE LEVEL CLOUDS AND HIGH CLOUD CEILINGS COVER SOUTHEASTERN LOUISIANA. SOME HIGH CLOUD CEILINGS ARE BEING OBSERVED IN THE FLORIDA PANHANDLE. SCATTERED TO BROKEN MIDDLE LEVEL CLOUDS COVER THE FLORIDA COAST FROM NAPLES TO THE TAMPA METROPOLITAN AREA. FAIR SKIES ARE OBSERVED FROM TAMPA TO THE FLORIDA PANHANDLE. FOR THE OFFSHORE OIL PLATFORM SITES THAT ARE TO THE NORTH OF 27N TO THE WEST OF 88W... SCATTERED LOW CLOUDS ARE AT THE ICAO STATION KGVX OFF THE TEXAS COAST. LOW CLOUD CEILINGS ARE AT ICAO STATIONS KGUL...KMYT...KGBK... KATP...AND KMDJ. ICAO STATION KECH IS REPORTING A VISIBILITY OF 1.25 MILES WITH HAZE. ICAO STATION KSPR REPORTS A MIDDLE LEVEL CLOUD CEILING. THE LOW CLOUD CEILING AND MIDDLE LEVEL CLOUD CEILING HAVE STARTED TO BREAK UP AT ICAO STATION KHQI. THE CARIBBEAN SEA... A MIDDLE LEVEL TO UPPER LEVEL RIDGE EXTENDS FROM NORTHWESTERN VENEZUELA NEAR 8N71W TO 13N79W... INTO THE NORTHWESTERN CORNER OF THE CARIBBEAN SEA. THE ANTICYCLONIC WIND FLOW IS PUSHING THIN HIGH CLOUDS FROM SOUTH AMERICA INTO THE CARIBBEAN SEA TO THE SOUTH OF 16N TO THE EAST OF 85W. RAINSHOWERS ARE POSSIBLE TO THE EAST OF 21N85W 16N84W...IN THE LOW CLOUD FIELD WITH THE SURFACE- TO-LOW LEVEL WIND FLOW. PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2... AND THE OFFSHORE FORECAST...MIAOFFNT3...FOR MORE DETAILS ABOUT THE 20 TO 25 KNOT WINDS AND 8 TO 10 FOOT SEA HEIGHTS FROM 10.5N TO 17N BETWEEN 70W AND 78W. ALSO EXPECT 20 TO 25 KNOT WINDS AND SEA HEIGHTS REACHING 9 FEET TO THE SOUTH OF 19N TO THE WEST OF 85W...INCLUDING IN THE GULF OF HONDURAS. THE REST OF THE ATLANTIC OCEAN... A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N23W TO 28N36W 20N53W TO 17N61W JUST OFF THE NORTHEASTERN CARIBBEAN SEA ISLANDS. CYCLONIC WIND FLOW THAT IS MOVING AROUND THE TROUGH COVERS THE ATLANTIC OCEAN TO THE NORTH OF 9N58W THROUGH 20N40W 27N30W 32N19W. A COLD FRONT PASSES THROUGH 32N35W TO 31N40W AND 31N45W. RAINSHOWERS ARE POSSIBLE TO THE NORTH OF THE LINE THAT PASSES THROUGH 32N19W TO 25N30W AND 23N54W. A SURFACE RIDGE PASSES THROUGH THE MADEIRA ARCHIPELAGO TO 29N30W...TO A 1025 MB HIGH PRESSURE CENTER THAT IS NEAR 29N54W 28N66W TO THE NORTHERN BAHAMAS NEAR GRAND BAHAMA ISLAND AND ABACO ISLAND. PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2... FOR MORE DETAILS ABOUT THE 12 HOUR FORECAST OF 20 KNOT WINDS OR LESS AND 8 TO 10 FOOT SEA HEIGHTS TO THE NORTHEAST OF THE LINE FROM 31N43W TO 29N35W. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ MT