000 AXNT20 KNHC 240549 TWDAT TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 205 AM EDT SUN AUG 24 2014 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 0000 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 0515 UTC. ...SPECIAL FEATURES... TROPICAL DEPRESSION FOUR ON 24/0300 UTC IS LOCATED OVER THE SOUTHERN BAHAMAS NEAR 22.3N 72.6W MOVING NORTHWEST AT 8 KT. THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1005 MB. MAXIMUM SUSTAINED WINDS ARE 30 KT WITH GUSTS TO 40 KT. SOME STRENGTHENING IS FORECAST DURING THE NEXT 48 HOURS...AND THE DEPRESSION IS FORECAST TO BECOME A TROPICAL STORM LATER TODAY. CLUSTERS OF SCATTERED MODERATE ISOLATED STRONG CONVECTION IS FROM 17N-25N BETWEEN 65W-73W...INCLUDING PUERTO RICO AND HISPANIOLA. THE DEPRESSION IS EXPECTED TO PRODUCE RAINFALL TOTALS OF 4 TO 8 INCHES OVER THE SOUTHEASTERN BAHAMAS...THE TURKS AND CAICOS ISLANDS...AND THE CENTRAL BAHAMAS THROUGH TUESDAY...WITH ISOLATED AMOUNTS AROUND 12 INCHES POSSIBLE. STORM TOTAL RAINFALL AMOUNTS OF UP TO 12 INCHES ARE POSSIBLE IN PORTIONS OF HISPANIOLA... WHERE THESE RAINS COULD PRODUCE LIFE-THREATENING FLASH FLOODS AND MUDSLIDES...ESPECIALLY IN AREAS OF MOUNTAINOUS TERRAIN. SEE LATEST NHC FORECAST/ADVISORY UNDER AWIPS/WMO HEADERS MIATCMAT4/WTNT24 KNHC FOR MORE DETAILS. ...TROPICAL WAVES... A TROPICAL WAVE IS JUST OFF THE COAST OF WEST AFRICA WITH AXIS EXTENDING FROM 20N18W TO 14N18W MOVING W AT 10 KT. SSMI TOTAL PRECIPITABLE WATER IMAGERY SHOWS A MOIST AREA ALONG THE COAST FROM 8N-20N. THE WAVE AXIS ALSO COINCIDES WITH A 700 MB TROUGH. SCATTERED MODERATE TO ISOLATED STRONG CONVECTION IS FROM 14N-17N BETWEEN 17W-21W. A TROPICAL WAVE IS WEST OF THE CAPE VERDE ISLANDS WITH AXIS EXTENDING FROM 18N27W TO12N28W MOVING W AT 10 KT. SSMI TOTAL PRECIPITABLE WATER IMAGERY SHOWS A LARGE MOIST AREA W OF THE CAPE VERDE ISLANDS. ISOLATED MODERATE CONVECTION IS FROM 10N-14N BETWEEN 29W-35W. A TROPICAL WAVE IS OVER THE CENTRAL ATLC WITH AXIS EXTENDING FROM 15N41W TO 9N42W MOVING W AT 10 KT. SCATTERED MODERATE CONVECTION IS FROM 10N-11N BETWEEN 42W-44W. ELSEWHERE....NO DEEP CONVECTION IS ASSOCIATED WITH THE WAVE AS DRY SAHARAN AIR AND DUST IS N OF 12N. ...ITCZ/MONSOON TROUGH... THE MONSOON TROUGH EXTENDS FROM THE WEST AFRICAN COAST NEAR 13N16W AND CONTINUES TO 9N33W TO 9N40W. THE ITCZ EXTENDS FROM 9N44W TO 9N55W. BESIDES THE CONVECTION ASSOCIATED WITH THE WAVES...NO OTHER AREAS OF SIGNIFICANT CONVECTION ARE NOTED. ...DISCUSSION... GULF OF MEXICO... A WEAK 1015 MB HIGH PRESSURE SYSTEM IS CENTERED ON THE N GULF NEAR 28N90W. SURFACE OBS AND SCATTEROMETER WINDS SHOW ANTICYCLONIC WINDS MAINLY BETWEEN 5-10 KT EVIDENT ACROSS THE GULF. ISOLATED MODERATE CONVECTION REMAINS OVER THE NE GULF FROM 28N-30N BETWEEN 83W-86W. WIDELY SCATTERED MODERATE CONVECTION IS OVER THE THE YUCATAN PENINSULA AND S MEXICO BETWEEN 89W-99W. IN THE UPPER LEVELS...THE BASE OF A LARGE UPPER LEVEL RIDGE IS OVER THE GULF. A VERY SMALL UPPER LEVEL LOW IS EMBEDDED OVER S FLORIDA NEAR 26N81W. ISOLATED MODERATE CONVECTION IS FROM 24N- 26N BETWEEN 81W-84W. EXPECT SCATTERED SHOWERS AND THUNDERSTORMS ACROSS N FLORIDA IN 24 HOURS DUE TO THE TAIL END OF A COLD FRONT. CARIBBEAN SEA... A 1005 MB LOW IS CENTERED OVER THE SOUTHERN BAHAMAS IS PRODUCING A LARGE AMOUNT OF CONVECTION AND GUSTY WINDS FROM PUERTO RICO TO NEAR JAMAICA. SEE THE SPECIAL FEATURE SECTION ABOVE. OUTSIDE OF THE IMMEDIATE CENTER OF THE LOW...10-15 KT CYCLONIC WINDS ARE OVER THE REMAINDER OF THE CARIBBEAN SEA. WIDELY SCATTERED MODERATE CONVECTION IS INLAND OVER THE YUCATAN PENINSULA. SCATTERED MODERATE TO STRONG CONVECTION IS OVER NW VENEZUELA AND N COLOMBIA FROM 7N-11N BETWEEN 71W-76W. ISOLATED MODERATE CONVECTION IS OVER...PANAMA...COSTA RICA...AND THE SW CARIBBEAN SEA S OF 12N BETWEEN 77W-84W MAINLY DUE TO A MONSOON TROUGH. IN THE UPPER LEVELS...A SMALL UPPER LEVEL LOW IS CENTERED OVER THE YUCATAN PENINSULA NEAR 18N90W. AN UPPER LEVEL HIGH IS CENTERED OVER JAMAICA. EXPECT THE SPECIAL FEATURE LOW TO MOVE TO THE CENTRAL BAHAMAS OVER THE NEXT 24 HOURS WITH RESIDUAL CONVECTION OVER THE NORTH CENTRAL CARIBBEAN AND LEEWARD ISLANDS. ...HISPANIOLA... THE RAINBANDS OF TROPICAL DEPRESSION FOUR CONTINUE TO AFFECT HISPANIOLA WITH SCATTERED HEAVY SHOWERS AND TSTMS WITH POTENTIAL OF CAUSING LOCALIZED FLOODING AND MUDSLIDES. RAINFALL ASSOCIATED WITH THE TROPICAL CYCLONE DESCRIBED IN SPECIAL FEATURES IS EXPECTED TO CONTINUE BEYOND MONDAY. ATLANTIC OCEAN... THERE IS A CONSIDERABLE AMOUNT OF CONVECTION N OF HISPANIOLA... SEE SPECIAL FEATURES SECTION ABOVE. A COLD FRONT IS OVER THE W ATLANTIC ALONG 32N BETWEEN 64W-77W. SCATTERED SHOWERS ARE N OF 29N. SURFACE HIGH PREVAILS ACROSS THE BASIN WITH CENTER NEAR 33N28W WITH RIDGING TO NEAR 26N60W. IN THE UPPER LEVELS... AN UPPER LEVEL HIGH IS CENTERED N OF THE LEEWARD ISLANDS NEAR 23N67W. UPPER LEVEL DIFFLUENCE W OF THE CENTER IS ENHANCING CONVECTION NORTH OF HISPANIOLA. EXPECT THE SPECIAL FEATURE LOW TO BE THE DOMINATE FEATURE IN THE ATLANTIC OVER THE NEXT 24 HOURS. ALSO EXPECT THE COLD FRONT TO DIP A BIT S OVER THE NEXT 24 HOURS WITH SCATTERED MODERATE CONVECTION N OF 28N BETWEEN 60W- 80W. FOR ADDITIONAL INFORMATION PLEASE VISIT HTTP://WWW.HURRICANES.GOV/MARINE $$ FORMOSA