Hurricane Irma
Forecast Advisory 21
908
WTNT21 KNHC 041446
TCMAT1
HURRICANE IRMA FORECAST/ADVISORY NUMBER 21
NWS NATIONAL HURRICANE CENTER MIAMI FL AL112017
1500 UTC MON SEP 04 2017
CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY...
THE GOVERNMENT OF ANTIGUA HAS ISSUED A HURRICANE WARNING FOR THE
ISLANDS OF ANTIGUA...BARBUDA...ANGUILLA...MONTSERRAT...ST.
KITTS...AND NEVIS. A HURRICANE WATCH HAS BEEN ISSUED FOR THE
BRITISH VIRGIN ISLANDS.
THE GOVERNMENT OF THE NETHERLANDS HAS ISSUED A HURRICANE WARNING FOR
THE ISLANDS OF SABA...ST. EUSTATIUS...AND SINT MAARTEN.
THE GOVERNMENT OF FRANCE HAS ISSUED A HURRICANE WARNING FOR ST.
MARTIN AND SAINT BARTHELEMY. A HURRICANE WATCH HAS BEEN ISSUED FOR
GUADELOUPE.
A HURRICANE WATCH HAS BEEN ISSUED FOR THE U.S. VIRGIN ISLANDS...
PUERTO RICO...VIEQUES...AND CULEBRA.
THE GOVERNMENT OF BARBADOS HAS ISSUED A TROPICAL STORM WATCH FOR
DOMINICA.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT...
A HURRICANE WARNING IS IN EFFECT FOR...
* ANTIGUA...BARBUDA...ANGUILLA...MONTSERRAT...ST. KITTS...AND
NEVIS
* SABA...ST. EUSTATIUS...AND SINT MAARTEN
* SAINT MARTIN AND SAINT BARTHELEMY
A HURRICANE WATCH IS IN EFFECT FOR...
* GUADELOUPE
* BRITISH VIRGIN ISLANDS
* U.S. VIRGIN ISLANDS
* PUERTO RICO...VIEQUES...AND CULEBRA
A TROPICAL STORM WATCH IS IN EFFECT FOR...
* DOMINICA
A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED
SOMEWHERE WITHIN THE WARNING AREA. A WARNING IS TYPICALLY ISSUED
36 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL-STORM-
FORCE WINDS...CONDITIONS THAT MAKE OUTSIDE PREPARATIONS DIFFICULT
OR DANGEROUS. 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 WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE
POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS.
INTERESTS IN THE DOMINICAN REPUBLIC...HAITI...THE TURKS AND CAICOS
ISLANDS...AND THE SOUTHEASTERN BAHAMAS SHOULD MONITOR THE PROGRESS
OF IRMA.
HURRICANE CENTER LOCATED NEAR 16.8N 53.3W AT 04/1500Z
POSITION ACCURATE WITHIN 15 NM
PRESENT MOVEMENT TOWARD THE WEST-SOUTHWEST OR 255 DEGREES AT 12 KT
ESTIMATED MINIMUM CENTRAL PRESSURE 944 MB
EYE DIAMETER 15 NM
MAX SUSTAINED WINDS 105 KT WITH GUSTS TO 130 KT.
64 KT....... 30NE 25SE 20SW 30NW.
50 KT....... 50NE 40SE 30SW 50NW.
34 KT.......120NE 90SE 60SW 100NW.
12 FT SEAS..270NE 120SE 150SW 270NW.
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 16.8N 53.3W AT 04/1500Z
AT 04/1200Z CENTER WAS LOCATED NEAR 16.8N 52.6W
FORECAST VALID 05/0000Z 16.5N 54.8W
MAX WIND 115 KT...GUSTS 140 KT.
64 KT... 30NE 25SE 20SW 25NW.
50 KT... 60NE 50SE 30SW 50NW.
34 KT...130NE 90SE 60SW 110NW.
FORECAST VALID 05/1200Z 16.7N 57.1W
MAX WIND 120 KT...GUSTS 145 KT.
64 KT... 30NE 30SE 25SW 30NW.
50 KT... 60NE 50SE 40SW 60NW.
34 KT...140NE 100SE 70SW 110NW.
FORECAST VALID 06/0000Z 17.3N 59.6W
MAX WIND 120 KT...GUSTS 145 KT.
64 KT... 35NE 35SE 30SW 35NW.
50 KT... 70NE 60SE 50SW 70NW.
34 KT...150NE 120SE 80SW 130NW.
FORECAST VALID 06/1200Z 18.2N 62.4W
MAX WIND 125 KT...GUSTS 150 KT.
50 KT... 80NE 70SE 50SW 70NW.
34 KT...160NE 130SE 90SW 140NW.
FORECAST VALID 07/1200Z 19.9N 68.0W
MAX WIND 120 KT...GUSTS 145 KT.
50 KT... 90NE 70SE 60SW 80NW.
34 KT...180NE 150SE 100SW 150NW.
EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM
ON DAY 4 AND 200 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY
OUTLOOK VALID 08/1200Z 21.2N 73.3W
MAX WIND 115 KT...GUSTS 140 KT.
OUTLOOK VALID 09/1200Z 22.0N 77.8W...NEAR THE COAST OF CUBA
MAX WIND 115 KT...GUSTS 140 KT.
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 16.8N 53.3W
NEXT ADVISORY AT 04/2100Z
$$
FORECASTER BROWN
