Hurricane Bill

Forecast Advisory 18

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531
WTNT23 KNHC 192030
TCMAT3
HURRICANE BILL FORECAST/ADVISORY NUMBER 18
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL032009
2100 UTC WED AUG 19 2009

INTERESTS IN THE NORTHERN LEEWARD ISLANDS AND BERMUDA SHOULD MONITOR
THE PROGRESS OF BILL.

HURRICANE CENTER LOCATED NEAR 19.8N 57.6W AT 19/2100Z
POSITION ACCURATE WITHIN 10 NM

PRESENT MOVEMENT TOWARD THE NORTHWEST OR 305 DEGREES AT 17 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 947 MB
EYE DIAMETER 30 NM
MAX SUSTAINED WINDS 115 KT WITH GUSTS TO 140 KT.
64 KT....... 75NE 45SE 30SW 45NW.
50 KT.......105NE 90SE 60SW 90NW.
34 KT.......200NE 175SE 100SW 175NW.
12 FT SEAS..400NE 330SE 240SW 350NW.
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 19.8N 57.6W AT 19/2100Z
AT 19/1800Z CENTER WAS LOCATED NEAR 19.3N 56.9W

FORECAST VALID 20/0600Z 21.1N 59.7W
MAX WIND 120 KT...GUSTS 145 KT.
64 KT... 75NE 45SE 30SW 45NW.
50 KT...105NE 90SE 60SW 90NW.
34 KT...200NE 175SE 100SW 175NW.

FORECAST VALID 20/1800Z 23.0N 62.4W
MAX WIND 125 KT...GUSTS 155 KT.
64 KT... 75NE 45SE 30SW 45NW.
50 KT...120NE 100SE 70SW 100NW.
34 KT...225NE 200SE 120SW 180NW.

FORECAST VALID 21/0600Z 25.2N 64.6W
MAX WIND 120 KT...GUSTS 145 KT.
64 KT... 75NE 45SE 30SW 45NW.
50 KT...120NE 100SE 70SW 100NW.
34 KT...225NE 200SE 120SW 180NW.

FORECAST VALID 21/1800Z 27.9N 66.6W
MAX WIND 120 KT...GUSTS 145 KT.
50 KT...120NE 100SE 70SW 100NW.
34 KT...225NE 200SE 120SW 180NW.

FORECAST VALID 22/1800Z 34.0N 69.0W
MAX WIND 110 KT...GUSTS 135 KT.
50 KT...120NE 100SE 70SW 100NW.
34 KT...225NE 200SE 120SW 180NW.

EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 225 NM
ON DAY 4 AND 300 NM ON DAY 5...AND FOR INTENSITY NEAR 20 KT EACH DAY

OUTLOOK VALID 23/1800Z 42.0N 65.5W
MAX WIND 95 KT...GUSTS 115 KT.

OUTLOOK VALID 24/1800Z 51.5N 50.5W...EXTRATROPICAL
MAX WIND 55 KT...GUSTS 65 KT.

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 19.8N 57.6W

NEXT ADVISORY AT 20/0300Z

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FORECASTER BLAKE