000 AXNT20 KNHC 061831 AAA TWDAT TROPICAL WEATHER DISCUSSION...AMD NWS NATIONAL HURRICANE CENTER MIAMI FL 205 PM EDT FRI SEP 06 2013 AMENDED IN ORDER TO INCLUDE UPDATED INFORMATION ABOUT THE TROPICAL DEPRESSION IN THE GULF OF MEXICO 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 1200 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 1715 UTC. ...SPECIAL FEATURES... TROPICAL DEPRESSION EIGHT DEVELOPED IN THE GULF OF MEXICO ALONG THE COAST OF MEXICO NEAR TAMPICO. THE CENTER OF TROPICAL DEPRESSION EIGHT AT 06/1830 UTC IS NEAR 22.5N 97.3W. THE DEPRESSION IS MOVING WEST-SOUTHWESTWARD 5 KNOTS. THE MINIMUM CENTRAL PRESSURE IS 1009 MB. THE MAXIMUM SUSTAINED WIND SPEEDS ARE 30 KNOTS WITH GUSTS TO 40 KNOTS. PLEASE READ THE NATIONAL HURRICANE CENTER PUBLIC ADVISORIES ON GABRIELLE...THAT ARE ISSUED UNDER WMO HEADER WTNT33 KNHC AND UNDER AWIPS HEADER MIATCPAT3...AND THE FORECAST/ADVISORIES THAT ARE ISSUED UNDER WMO HEADER WTNT23 KNHC AND UNDER AWIPS HEADER MIATCMAT3. CONVECTIVE PRECIPITATION...NUMEROUS STRONG FROM 21N TO 25N BETWEEN 94W AND 99W. SCATTERED MODERATE TO ISOLATED STRONG FROM 24N TO 26N BETWEEN 90W AND 93W. ISOLATED MODERATE ELSEWHERE TO THE NORTH OF 26N TO THE WEST OF 90W...AND TO THE SOUTH AND SOUTHEAST OF THE TROPICAL DEPRESSION. ...TROPICAL WAVES... AN ATLANTIC OCEAN TROPICAL WAVE WAS ANALYZED ALONG 18W/19W TO THE SOUTH OF 20N. FURTHER ANALYSIS OF THE SITUATION GIVES US THE IDEA THAT THE WAVE REALLY STILL IS MORE INLAND IN AFRICA...AND NOT IN THE ATLANTIC OCEAN YET. IT MAY TAKE ANOTHER DAY OR TWO FOR THE WAVE TO EMERGE FROM AFRICA. CONVECTIVE PRECIPITATION... NUMEROUS STRONG FROM 13N TO 15N BETWEEN 17W AND 18W...AND FROM 9N TO 10N BETWEEN 18W AND 20W. AN ATLANTIC OCEAN TROPICAL WAVE IS ALONG 34W TO THE SOUTH OF 20N...MOVING WESTWARD 10 TO 15 KNOTS. A 1012 MB LOW PRESSURE CENTER IS ALONG THE WAVE NEAR 14N. CONVECTIVE PRECIPITATION... SCATTERED MODERATE TO ISOLATED STRONG FROM 12N TO 19N BETWEEN 28W AND 38W. THE ATLANTIC OCEAN TROPICAL WAVE THAT WAS ALONG 19N59W 14N57W 10N54W FOR THE 06/0600 UTC MAP ANALYSIS HAS BEEN DROPPED FROM THE MAP ANALYSIS FOR 06/1200 UTC. THE WAVE WAS BEING STRETCHED AS IT WAS MOVING AROUND THE SOUTHWESTERN PERIPHERY OF AN ANTICYCLONE. THERE WAS NO MORE EVIDENCE OF CYCLONIC TURNING. A CARIBBEAN SEA TROPICAL WAVE IS ALONG 74W/75W TO THE SOUTH OF 15N MOVING WEST 10 TO 15 KNOTS. THIS WAVE HAS CONTINUED WESTWARD AFTER GABRIELLE WAS FORMED. CONVECTIVE PRECIPITATION...SCATTERED TO NUMEROUS IN COLOMBIA FROM 7N TO 8N BETWEEN 74W AND 75W. SCATTERED TO NUMEROUS IN THE CARIBBEAN SEA FROM 14N TO 17N BETWEEN 76W AND 81W. A CARIBBEAN SEA TROPICAL WAVE IS ALONG 83W/84W TO THE SOUTH OF 19N. THE WAVE IS MOVING WESTWARD 10 TO 15 KNOTS DURING THE LAST 24 HOURS OR SO. THE WAVE IS MOVING THROUGH THE AREA OF AN INVERTED TROUGH THAT RUNS FROM HONDURAS BEYOND NICARAGUA. ...THE ITCZ/THE MONSOON TROUGH... THE MONSOON TROUGH PASSES THROUGH COASTAL GUINEA-BISSAU NEAR 12N16W TO 14N27W 14N34W...11N38W AND 10N43W. CONVECTIVE PRECIPITATION...SCATTERED MODERATE FROM 5N TO 9N BETWEEN 22W AND 29W. ISOLATED MODERATE FROM 5N TO 10N BETWEEN 36W AND 53W. ...DISCUSSION... FROM THE ATLANTIC OCEAN INTO THE GULF OF MEXICO... A MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH THE SOUTHEASTERN UNITED STATES...ACROSS NORTHERN FLORIDA...INTO THE NORTHEASTERN/EASTERN GULF OF MEXICO. A SURFACE TROUGH IS ALONG 31N80W...ACROSS NORTHERN FLORIDA...INTO THE GULF OF MEXICO NEAR 28N85W. CONVECTIVE PRECIPITATION...IN THE ATLANTIC OCEAN TO THE NORTH OF THE LINE THAT PASSES THROUGH 32N64W 30N68W...TO THE FLORIDA COAST NEAR 29N81W. CONVECTIVE PRECIPITATION IN THE GULF OF MEXICO...SCATTERED MODERATE TO ISOLATED STRONG TO THE SOUTH OF 27N TO THE EAST OF 90W. THE REST OF THE GULF OF MEXICO... THE SURFACE PRESSURE GRADIENT IS COMPARATIVELY WEAK IN THE GULF OF MEXICO...EVERYWHERE ELSE AWAY FROM THE TROPICAL DEPRESSION THAT IS ALONG THE MEXICO COAST NEAR TAMPICO. FOR THE OFFSHORE OIL PLATFORM SITES THAT ARE TO THE NORTH OF 27N TO THE WEST OF 88W... A LOW CLOUD CEILING AT 5500 FEET IS REPORTED AT THE ICAO STATION KBQX ALONG THE TEXAS GULF COAST. FAIR SKIES/CLEAR SKIES AT OR LOWER THAN 12000 FEET ARE BEING REPORTED ELSEWHERE ACROSS THE AREA. SCATTERED TO BROKEN LOW CLOUDS AND LIGHT RAIN ARE IN THE DEEP SOUTH OF TEXAS/ALONG THE BORDER WITH TEXAS. SCATTERED TO BROKEN LOW CLOUDS COVER THE MIDDLE TEXAS GULF COASTAL PLAINS. BROKEN MULTILAYERED CLOUD CEILINGS AND RAIN COVER THE COASTAL AREAS FROM ANGLETON/LAKE JACKSON TO GALVESTON TO BEAUMONT-PORT ARTHUR. SCATTERED TO BROKEN LOW CLOUDS ARE IN THE COASTAL SECTIONS OF SOUTHWESTERN LOUISIANA. MULTILAYERED CLOUD CEILINGS AND RAINSHOWERS WITH THUNDER ARE IN THE AREA THAT IS TO THE SOUTH OF LAKE PONTCHARTAIN IN LOUISIANA. BROKEN HIGH CLOUDS COVER MOBILE ALABAMA...AND IN THE FLORIDA PANHANDLE IN PENSACOLA AND VALPARAISO. SCATTERED LOW CLOUDS AND BROKEN HIGH CLOUDS ARE AT THE TAMPA INTERNATIONAL AIRPORT. MIDDLE LEVEL AND HIGH LEVEL CLOUD CEILINGS ARE OBSERVED AT THE KEY WEST FLORIDA NAVAL AIR STATION. FAIR SKIES/CLEAR SKIES AT OR LOWER THAN 12000 FEET ARE BEING REPORTED ELSEWHERE IN THE COASTAL SECTIONS OF THE U.S.A. GULF COAST STATES. PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2...AND THE OFFSHORE FORECAST...MIAOFFNT4...FOR MORE DETAILS ABOUT TROPICAL DEPRESSION EIGHT THAT IS ALONG THE MEXICO COAST NEAR TAMPICO. FROM THE ATLANTIC OCEAN INTO THE CARIBBEAN SEA... A MIDDLE LEVEL TO UPPER LEVEL TROUGH EXTENDS FROM A 31N57W CYCLONIC CIRCULATION CENTER...TO 26N54W. MIDDLE LEVEL TO UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS THE ATLANTIC OCEAN FROM 10N TO 26N TO BETWEEN 50W AND AND 60W. THE ANTICYCLONIC WIND FLOW CONTINUES FROM THE ATLANTIC OCEAN INTO THE CARIBBEAN SEA...TO THE EAST OF 84W. THE 1010 MB REMNANT LOW PRESSURE CENTER OF GABRIELLE IS NEAR 20N68W. ONE TROUGH EXTENDS FROM THE LOW CENTER NORTHEASTWARD TO 22N64W AND 25N62W. A SECOND TROUGH EXTENDS FROM THE LOW CENTER ACROSS THE EASTERN DOMINICAN REPUBLIC TO 17N70W. A SEPARATE SURFACE TROUGH IS ALONG 25N66W 29N64W. CONVECTIVE PRECIPITATION...NUMEROUS STRONG IN THE MONA PASSAGE FROM 17N TO 21N BETWEEN 67W AND 69W. NUMEROUS STRONG FROM 25N TO 29N BETWEEN 61W AND 66W. WIDELY SCATTERED TO SCATTERED MODERATE TO ISOLATED STRONG ELSEWHERE IN THE ATLANTIC OCEAN AND IN THE CARIBBEAN SEA WITHIN 120 NM TO 180 NM ON EITHER SIDE OF 30N56W 25N58W 14N66W. THE 24-HOUR RAINFALL TOTALS IN INCHES FOR THE PERIOD ENDING AT 06/1200 UTC...ACCORDING TO THE PAN AMERICAN TEMPERATURE AND PRECIPITATION TABLES...MIATPTPAN...ARE 5.28 IN ST. THOMAS IN THE VIRGIN ISLANDS...0.49 IN SAN JUAN PUERTO RICO...AND 1.35 IN BERMUDA. THE REST OF THE CARIBBEAN SEA... MIDDLE LEVEL TO UPPER LEVEL NORTHERLY WIND FLOW COVERS THE REST OF THE CARIBBEAN SEA THAT IS TO THE WEST OF 84W. THE WESTERN CARIBBEAN SEA TROUGH THAT COVERED THIS AREA DURING THE LAST FEW DAYS HAS WEAKENED AND DISSIPATED. AN INVERTED MIDDLE LEVEL TO UPPER LEVEL TROUGH EXTENDS FROM EASTERN HONDURAS...THROUGH AND BEYOND NICARAGUA SOUTHWESTWARD. THE 24-HOUR RAINFALL TOTALS IN INCHES FOR THE PERIOD ENDING AT 06/1200 UTC...ACCORDING TO THE PAN AMERICAN TEMPERATURE AND PRECIPITATION TABLES...MIATPTPAN...ARE 1.60 IN GUADELOUPE...AND 1.49 IN TRINIDAD. THE MONSOON TROUGH IS ALONG 8N73W IN COLOMBIA...TO 8N81W IN PANAMA...BEYOND COASTAL PANAMA/COASTAL COSTA RICA ALONG 83W... INTO THE EASTERN PACIFIC OCEAN. CONVECTIVE PRECIPITATION... NUMEROUS STRONG TO THE SOUTH OF 12N BETWEEN 77W AND 81W. HISPANIOLA... THE 1010 MB REMNANT LOW PRESSURE CENTER OF GABRIELLE IS NEAR 20N68W...ABOUT 90 NM TO THE NORTHEAST OF THE DOMINICAN REPUBLIC. A SURFACE TROUGH EXTENDS FROM THE LOW CENTER ACROSS THE EASTERNMOST PART OF THE DOMINICAN REPUBLIC TO 17N70W IN THE CARIBBEAN SEA. CONVECTIVE PRECIPITATION...NUMEROUS STRONG IN THE MONA PASSAGE FROM 17N TO 21N BETWEEN 67W AND 69W. MIDDLE LEVEL TO UPPER LEVEL ANTICYCLONIC WIND FLOW COVERS HISPANIOLA. THE GFS FORECAST FOR 700 MB SHOWS THAT AN INVERTED TROUGH WILL COVER HISPANIOLA FOR THE FIRST 24 HOURS...FOLLOWED BY AN EAST-TO- WEST RIDGE FOR THE REST OF THE FORECAST PERIOD. THE INVERTED TROUGH WILL MOVE NORTHWESTWARD...OUT OF THE AREA. THE GFS FORECAST FOR 500 MB SHOWS THAT AN INVERTED TROUGH/AREA OF CYCLONIC WIND FLOW WILL COVER HISPANIOLA FOR THE ENTIRE 48 HOUR PERIOD. THE GFS FORECAST FOR 250 MB SHOWS THAT HISPANIOLA WILL BE ON THE NORTHERN EDGE OF AN EAST-TO-WEST ORIENTED RIDGE FOR THE ENTIRE TIME. THE REST OF THE ATLANTIC OCEAN... A MIDDLE LEVEL TO UPPER LEVEL CYCLONIC CIRCULATION CENTER IS NEAR 25N42W. A TROUGH PASSES THROUGH 32N43W...TO THE CYCLONIC CENTER...TO 17N45W. AN EASTERN ATLANTIC OCEAN MIDDLE LEVEL TO UPPER LEVEL TROUGH PASSES THROUGH 32N15W TO 26N20W AND 22N22W. A DISSIPATING COLD FRONT PASSES THROUGH 33N17W TO 32N26W. A SURFACE RIDGE EXTENDS FROM A 1022 MB HIGH PRESSURE CENTER THAT IS NEAR 33N46W TO 25N49W AND 14N49W. PLEASE READ THE HIGH SEAS FORECAST...MIAHSFAT2...FOR MORE DETAILS ABOUT 1010 MB LOW CENTER...REMNANTS OF T.D. GABRIELLE...NEAR 20N68W...WITH A TROUGH EXTENDING TO 28N65W. EXPECT 20 TO 25 KNOT WINDS AND SEA HEIGHTS LOWER THAN 8 FEET WITHIN 120 NM IN NORTHEAST SEMICIRCLE AND WITHIN 90 NM IN NORTHWESTERN QUADRANT OF THE LOW CENTER. EXPECT SOUTHEAST WINDS 20 TO 25 KNOTS AND SEA HEIGHTS FROM 8 TO 10 FEET FROM 19N TO 24N TO THE EAST OF THE TROUGH TO 61W. EXPECT ALSO 20 KNOT WINDS OR LESS AND SEA HEIGHTS TO 8 FEET FROM 24N TO 27N TO THE EAST OF THE TROUGH TO 62W. A SECOND FEATURE IS A 1012 MB LOW PRESSURE CENTER THAT IS NEAR 15N34W. EXPECT NORTHEAST 20 TO 25 KNOT WINDS AND SEA HEIGHTS TO 9 FEET FROM 16N TO 21N TO THE EAST OF 37W. EXPECT ALSO WINDS 20 KNOTS OR LESS AND SEA HEIGHTS TO 8 FEET ELSEWHERE FROM 14N TO 20N TO THE EAST OF 40W. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ MT