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HURRICANE ISAAC FORECAST/ADVISORY NUMBER  20
NATIONAL WEATHER SERVICE MIAMI FL   AL1300
0900Z TUE SEP 26 2000
 
HURRICANE CENTER LOCATED NEAR 18.7N  43.0W AT 26/0900Z
POSITION ACCURATE WITHIN  20 NM
 
PRESENT MOVEMENT TOWARD THE WEST NORTHWEST OR 300 DEGREES AT  9 KT
 
ESTIMATED MINIMUM CENTRAL PRESSURE  970 MB
MAX SUSTAINED WINDS  90 KT WITH GUSTS TO 110 KT.
64 KT....... 25NE  25SE  25SW  25NW.
50 KT....... 60NE  45SE  45SW  60NW.
34 KT.......140NE 120SE 100SW 140NW.
12 FT SEAS..250NE 150SE 150SW 250NW.
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 18.7N  43.0W AT 26/0900Z
AT 26/0600Z CENTER WAS LOCATED NEAR 18.5N  42.6W
 
FORECAST VALID 26/1800Z 19.3N  44.2W
MAX WIND  90 KT...GUSTS 110 KT.
64 KT... 25NE  25SE  25SW  25NW.
50 KT... 60NE  45SE  45SW  60NW.
34 KT...140NE 120SE 100SW 140NW.
 
FORECAST VALID 27/0600Z 20.3N  46.0W
MAX WIND  90 KT...GUSTS 110 KT.
64 KT... 25NE  25SE  25SW  25NW.
50 KT... 60NE  45SE  45SW  60NW.
34 KT...140NE 120SE 100SW 140NW.
 
FORECAST VALID 27/1800Z 21.4N  47.9W
MAX WIND  90 KT...GUSTS 110 KT.
64 KT... 25NE  25SE  25SW  25NW.
50 KT... 60NE  45SE  45SW  60NW.
34 KT...140NE 120SE 100SW 140NW.
 
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.7N  43.0W
 
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE
 
OUTLOOK VALID 28/0600Z 23.0N  50.5W
MAX WIND  90 KT...GUSTS 110 KT.
50 KT... 60NE  45SE  45SW  60NW.
 
OUTLOOK VALID 29/0600Z 27.0N  55.5W
MAX WIND  90 KT...GUSTS 110 KT.
50 KT... 60NE  45SE  45SW  60NW.
 
NEXT ADVISORY AT 26/1500Z
 
FORECASTER FRANKLIN
 
 
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