000 AXNT20 KNHC 071151 TWDAT TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 805 AM EDT SAT SEP 07 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 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 1015 UTC. ...SPECIAL FEATURES... TROPICAL DEPRESSION EIGHT WAS DOWNGRADED TO A POST-TROPICAL CYCLONE AT 07/0900 UTC AND WAS CENTERED NEAR 21.4N 99.3W AT 07/0900 UTC OR ABOUT 90 NM W-SW OF TAMPICO MEXICO MOVING W-SW AT 6 KT. ESTIMATED MINIMUM CENTRAL PRESSURE IS 1009 MB. MAXIMUM SUSTAINED WIND SPEED IS 25 KT WITH GUSTS TO 35 KT. THIS WAS THE LAST ADVISORY WRITTEN BY THE NATIONAL HURRICANE CENTER. CLUSTERS OF SCATTERED SHOWERS/ISOLATED THUNDERSTORMS ARE S OF 25N W OF 95W TO INLAND OVER MEXICO. ...TROPICAL WAVES... TROPICAL WAVE IN THE CENTRAL ATLC EXTENDS FROM 19N34W THROUGH A 1010 MB LOW NEAR 14N35W TO 10N35W. WAVE HAS BECOME STATIONARY OVER THE PAST 18 HOURS. LOW/WAVE IS EMBEDDED WITHIN A BROAD SURGE OF DEEP MOISTURE AS DEPICTED ON TOTAL PRECIPITABLE WATER IMAGERY. LOW IS WELL DEFINED IN THE LOW AND MID LEVEL SATELLITE WINDS. SCATTERED MODERATE/ISOLATED STRONG CONVECTION IS WITHIN 75 NM OF LINE FROM 15N30W TO 18N32W. TROPICAL WAVE IN THE CENTRAL CARIBBEAN EXTENDS FROM 17N79W TO 9N80W. WAVE HAS BEEN MOVING W-NW 10-15 KT FOR THE PAST 24 HOURS. WAVE IS EMBEDDED WITHIN AN AREA OF DEEP MOISTURE THAT COVERS THE CARIBBEAN AS DEPICTED ON TOTAL PRECIPITABLE WATER IMAGERY. CLUSTERS OF SCATTERED SHOWERS/ISOLATED THUNDERSTORMS ARE WITHIN 90 NM OF LINE FROM 17N77W TO 14N84W. TROPICAL WAVE IN THE W CARIBBEAN IS ALONG 87W S OF 18N TO INLAND OVER CENTRAL AMERICA. WAVE HAS BEEN MOVING 10-15 KT FOR THE PAST 24 HOURS. WAVE IS EMBEDDED WITHIN AN AREA OF DEEP MOISTURE THAT COVERS THE CARIBBEAN AS DEPICTED ON TOTAL PRECIPITABLE WATER IMAGERY. SCATTERED SHOWERS/ISOLATED THUNDERSTORMS ARE INLAND AND WITHIN 60 NM ALONG THE COAST OF HONDURAS/GUATEMALA W OF 85W. ...THE ITCZ/THE MONSOON TROUGH... THE MONSOON TROUGH EXTENDS ACROSS AFRICA INTO THE E TROPICAL ATLC NEAR 15N17W AND CONTINUES ALONG 13N21W THROUGH THE LOW/TROPICAL WAVE NEAR 14N35W TO 9N43W WHERE THE ITCZ BEGINS AND CONTINUES ALONG 8N52W TO SOUTH AMERICA NEAR 8N60W. CLUSTERS OF SCATTERED MODERATE TO ISOLATED STRONG CONVECTION ARE FROM 9N-16N E OF 24W TO INLAND OVER W AFRICA. CLUSTERS OF ISOLATED THUNDERSTORMS ARE FROM 5N-11N BETWEEN 42W-55W. ...DISCUSSION... GULF OF MEXICO... A BROAD UPPER RIDGE IS ANCHORED ALONG THE W COAST OF MEXICO AND EXTENDS AN AXIS ACROSS THE S GULF ALONG 19N BETWEEN MEXICO AND THE YUCATAN PENINSULA. THE REMNANTS OF T.D. EIGHT ARE BENEATH THIS UPPER RIDGE. A BROAD UPPER TROUGH COVERS THE REMAINDER OF THE GULF SUPPORTING A COLD FRONT THAT AT 07/0900 UTC CLIPS THE FAR NE GULF IN THE BIG BEND AREA OF FLORIDA. CLUSTERS OF SCATTERED SHOWERS/ISOLATED THUNDERSTORMS ARE FROM 27N-30N E OF 94W. WEAK SURFACE RIDGE IS BRIDGING THE ABOVE FRONT. SCATTERED SHOWERS/ISOLATED THUNDERSTORMS DOT THE REMAINDER OF THE AREA FROM 21N-25N E OF 95W THROUGH THE STRAITS OF FLORIDA. WEAK SURFACE RIDGING WILL PERSIST ACROSS THE N GULF THROUGH SUN NIGHT BEFORE IT IS REPLACED BY STRONGER HIGH PRESSURE FROM THE W ATLC. CARIBBEAN SEA... THE UPPER RIDGE OVER THE GULF OF MEXICO COVERS THE YUCATAN PENINSULA. THE UPPER TROUGH OVER THE GULF OF MEXICO NARROWS AS IT EXTENDS S OVER THE NW CARIBBEAN ACROSS W CUBA TO CENTRAL HONDURAS. AN UPPER RIDGE COVERS THE REMAINDER OF THE CARIBBEAN ANCHORED SW OF HAITI NEAR 17N75W AND EXTENDING A RIDGE AXIS E ACROSS THE LEEWARD ISLANDS INTO THE W TROPICAL ATLC. CLUSTERS OF SCATTERED SHOWERS/ISOLATED THUNDERSTORMS DOT THE N CARIBBEAN N OF 18N BETWEEN 78W-87W AND IN THE S CARIBBEAN S OF 16N BETWEEN 73W-78W. THE MONSOON TROUGH EXTENDS ACROSS S PANAMA IN THE E PACIFIC REGION. THE REMNANTS OF GABRIELLE CONTINUES TO PULL N AWAY FROM HISPANIOLA. SCATTERED SHOWERS/ISOLATED THUNDERSTORMS REMAIN N OF 17N BETWEEN 64W-70W INCLUDING THE ISLANDS FROM THE LEEWARD TO THE DOMINICAN REPUBLIC. THE REMNANT LOW OF GABRIELLE WILL CONTINUE TO MOVE AWAY FROM THE CARIBBEAN THROUGH SUN. FRESH SE WINDS WILL DEVELOP ACROSS MUCH OF THE E CARIBBEAN THROUGH SUN. THE W CARIBBEAN TROPICAL WAVE WILL MOVE OVER THE YUCATAN LATER THIS MORNING. THE CENTRAL CARIBBEAN TROPICAL WAVE WILL MOVE INLAND OVER CENTRAL AMERICA TONIGHT. HISPANIOLA... CLUSTERS OF SCATTERED SHOWERS AND POSSIBLE ISOLATED THUNDERSTORMS REMAIN ACROSS THE ISLAND THIS MORNING DUE TO THE UPPER RIDGE ANCHORED SW OF HAITI AND THE REMNANT LOW OF GABRIELLE/SURFACE TROUGH LOCATED N OF THE DOMINICAN REPUBLIC. THESE SHOWERS/THUNDERSTORMS COULD CONTINUE THROUGH SUN WHEN THE LOW WILL DISSIPATE AS THE SURFACE TROUGH DRIFTS W. ATLANTIC OCEAN... BROAD UPPER TROUGH COVERS THE W ATLC N OF 25N W OF 63W SUPPORTING A COLD FRONT THAT EXTENDS AT 07/0900 UTC THROUGH 32N73W ALONG 29N80W THEN OVER NE FLORIDA NEAR DAYTONA BEACH TO OVER THE SE CONUS. SCATTERED SHOWERS/ISOLATED THUNDERSTORMS ARE N OF A LINE FROM MIAMI FLORIDA ALONG 27N75W TO 32N70W. THE UPPER RIDGE OVER THE CARIBBEAN COVERS THE SW ATLC S OF 25N W OF 50W. BENEATH THIS UPPER RIDGE IS A 1010 MB LOW...REMNANTS OF GABRIELLE...N OF HISPANIOLA NEAR 22N69W WITH A SURFACE TROUGH EXTENDING ALONG 26N68W TO 30N66W. SCATTERED SHOWERS/ISOLATED THUNDERSTORMS ARE FROM 19N-32N BETWEEN 55W-68W. THE REMAINDER OF THE ATLC IS DOMINATED BY A SURFACE RIDGE ANCHORED BY A 1021 MB HIGH AND A 1027 MB HIGH N OF THE DISCUSSION AREA. THE REMNANT LOW OF GABRIELLE WILL MOVE SLOWLY NW TO N. THE SURFACE TROUGH IS EXPECTED TO DRIFT W THROUGH TONIGHT WHILE THE LOW IS EXPECTED TO DISSIPATE TUE. A WEAK COLD FRONT WILL SWEEP ACROSS THE N CENTRAL WATERS THROUGH MON AS A WEAK PRESSURE PATTERN SETS ACROSS MUCH OF THE AREA LATE MON THROUGH WED. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ PAW