948 
 WTNT24 KNHC 260851
 TCMAT4
  
 TROPICAL STORM ISAAC FORECAST/ADVISORY NUMBER  21
 NWS NATIONAL HURRICANE CENTER MIAMI FL       AL092012
 0900 UTC SUN AUG 26 2012
  
 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
  
 A HURRICANE WATCH HAS BEEN ISSUED FROM THE MOUTH OF THE MISSISSIPPI
 RIVER EASTWARD TO INDIAN PASS FLORIDA...NOT INCLUDING METROPOLITAN
 NEW ORLEANS.
  
 THE TROPICAL STORM WARNING HAS BEEN EXTENDED NORTHWARD AND WESTWARD
 ALONG THE FLORIDA WEST COAST AND THE FLORIDA PANHANDLE TO INDIAN
 PASS.
  
 THE GOVERNMENT OF THE BAHAMAS HAS DISCONTINUED THE TROPICAL STORM
 WARNING FOR THE TURKS AND CAICOS ISLANDS.
  
 SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
  
 A HURRICANE WARNING IS IN EFFECT FOR...
 * THE FLORIDA KEYS INCLUDING THE DRY TORTUGAS
 * THE WEST COAST OF FLORIDA FROM BONITA BEACH SOUTHWARD TO OCEAN
 REEF
 * FLORIDA BAY
 * ANDROS ISLAND IN THE BAHAMAS
  
 A HURRICANE WATCH IS IN EFFECT FOR...
 * THE FLORIDA EAST COAST FROM GOLDEN BEACH SOUTHWARD TO OCEAN REEF
 * THE MOUTH OF THE MISSISSIPPI RIVER TO INDIAN PASS FLORIDA...NOT
 INCLUDING METROPOLITAN NEW ORLEANS
  
 A TROPICAL STORM WARNING IS IN EFFECT FOR...
 * CUBAN PROVINCES OF CIEGO DE AVILA...SANCTI SPIRITUS...VILLA
 CLARA...CAMAGUEY...LAS TUNAS...GRANMA...HOLGUIN...SANTIAGO DE
 CUBA...AND GUANTANAMO
 * THE BAHAMAS EXCLUDING ANDROS ISLAND
 * THE FLORIDA EAST COAST FROM SEBASTIAN INLET SOUTHWARD TO OCEAN
 REEF
 * LAKE OKEECHOBEE
 * THE FLORIDA WEST COAST AND THE FLORIDA PANHANDLE FROM NORTH OF
 BONITA BEACH TO INDIAN PASS...INCLUDING TAMPA BAY
  
 A TROPICAL STORM WATCH IS IN EFFECT FOR...
 * CUBAN PROVINCES OF MATANZAS AND CIENFUEGOS
 * THE FLORIDA EAST COAST NORTH OF SEBASTIAN INLET TO FLAGLER BEACH
  
 A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
 SOMEWHERE WITHIN THE WARNING AREA...IN THIS CASE WITHIN THE NEXT 24
 HOURS. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED
 TO COMPLETION.
  
 A HURRICANE WATCH MEANS THAT HURRICANE CONDITIONS ARE POSSIBLE
 WITHIN THE WATCH AREA. A WATCH IS TYPICALLY ISSUED 48 HOURS
 BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL-STORM-FORCE
 WINDS...CONDITIONS THAT MAKE OUTSIDE PREPARATIONS DIFFICULT OR
 DANGEROUS.
  
 A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE
 EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS.
  
 A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
 POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS.
  
 INTERESTS IN THE REMAINDER OF CUBA...THE REMAINDER OF FLORIDA...AND
 THE REMAINDER OF THE NORTHERN GULF COAST SHOULD MONITOR THE PROGRESS
 OF ISAAC.
  
 TROPICAL STORM CENTER LOCATED NEAR 23.1N  79.0W AT 26/0900Z
 POSITION ACCURATE WITHIN  25 NM
  
 PRESENT MOVEMENT TOWARD THE NORTHWEST OR 305 DEGREES AT  16 KT
  
 ESTIMATED MINIMUM CENTRAL PRESSURE  995 MB
 MAX SUSTAINED WINDS  55 KT WITH GUSTS TO  65 KT.
 50 KT....... 60NE   0SE   0SW   0NW.
 34 KT.......180NE 180SE   0SW 180NW.
 12 FT SEAS..250NE 250SE  45SW 180NW.
 WINDS AND SEAS VARY GREATLY IN EACH QUADRANT.  RADII IN NAUTICAL
 MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.
  
 REPEAT...CENTER LOCATED NEAR 23.1N  79.0W AT 26/0900Z
 AT 26/0600Z CENTER WAS LOCATED NEAR 22.8N  78.2W
  
 FORECAST VALID 26/1800Z 24.2N  80.8W
 MAX WIND  60 KT...GUSTS  75 KT.
 50 KT... 60NE  30SE   0SW   0NW.
 34 KT...180NE 180SE   0SW 180NW.
  
 FORECAST VALID 27/0600Z 25.5N  83.1W
 MAX WIND  65 KT...GUSTS  80 KT.
 64 KT... 20NE  10SE   0SW  10NW.
 50 KT... 60NE  60SE  30SW  40NW.
 34 KT...180NE 180SE  60SW 180NW.
  
 FORECAST VALID 27/1800Z 26.9N  84.9W
 MAX WIND  70 KT...GUSTS  85 KT.
 64 KT... 30NE  20SE  10SW  20NW.
 50 KT... 60NE  60SE  40SW  50NW.
 34 KT...180NE 150SE  80SW 160NW.
  
 FORECAST VALID 28/0600Z 28.1N  86.5W
 MAX WIND  80 KT...GUSTS 100 KT.
 50 KT... 70NE  60SE  50SW  60NW.
 34 KT...180NE 150SE  90SW 160NW.
  
 FORECAST VALID 29/0600Z 30.2N  88.0W
 MAX WIND  90 KT...GUSTS 110 KT.
 50 KT... 80NE  70SE  60SW  60NW.
 34 KT...150NE 150SE 110SW 110NW.
  
 EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 175 NM
 ON DAY 4 AND 225 NM ON DAY 5...AND FOR INTENSITY NEAR 20 KT EACH DAY
  
 OUTLOOK VALID 30/0600Z 32.0N  88.5W...INLAND
 MAX WIND  40 KT...GUSTS  50 KT.
  
 OUTLOOK VALID 31/0600Z 34.0N  88.5W...INLAND
 MAX WIND  25 KT...GUSTS  35 KT.
  
 REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 23.1N  79.0W
  
 NEXT ADVISORY AT 26/1500Z
  
 $$
 FORECASTER BRENNAN