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Bill Expected to Weaken but Still Produce Strong Winds over N. Atlantic

47.0N 50.6W

August 24th, 2009 Category: Tropical Storms

Tropical Storm Bill - August 23rd, 2009

Tropical Storm Bill - August 23rd, 2009

Enhanced image - August 23rd, 2009

Enhanced image

Track of Bill - August 24th, 2009 © Univ. of Wisconsin

Track of Bill

At 5:00 AM AST (0900 UTC) the center of Tropical Storm Bill was located about 190 miles (305 km) northeast of Cape Race, Newfoundland.

Bill is moving toward the east-northeast near 43 mph (69 km/hr). An east-northeast motion with some increase in forward speed is expected during the next day or two.

Maximum sustained winds are near 70 mph (110 km/hr) with higher gusts. The system has lost its tropical characteristics, and gradual weakening is forecast during the next couple of days.

Even though Bill is no longer a tropical cyclone, it is expected to produce a large area of storm and gale force winds over the North Atlantic during the next day or two. Currently, tropical storm force winds extend outward up to 315 miles (510 km) from the center. Estimated minimum central pressure is 980 mb (28.94 inches).

Bill Remains Extremely Dangerous Category 4 Hurricane

19.7N 57.5W

August 20th, 2009 Category: Tropical Cyclones

Hurricane Bill - August 19th, 2009

Hurricane Bill - August 19th, 2009

Enhanced image - August 19th, 2009

Three day composite - August 15th, 17th and 19th, 2009

Three day composite (August 15th, 17th and 19th) - Earth View

Three day composite (August 15th, 17th and 19th) - Earth View

Enhanced image - August 19th, 2009

Enhanced image - August 19th, 2009

Bill remains an extremely dangerous Category 4 Hurricane, now moving northwestward.

Interests in the northern Leeward Islands and Bermuda should monitor the progress of Bill.

At 500 pm AST (2100 UTC) the center of hurricane Bill was located near latitude 19.8 north, longitude 57.6 west or about 335 miles (535 km) northeast of the Leeward Islands and about 970 miles (1565 km) south-southeast of Bermuda. Bill is moving toward the northwest near 20 mph (32 km/h) and this general motion is expected for the next day or so with a turn toward the north-northwest forecast by late Friday.

Maximum sustained winds are near 135 mph (215 km/h) with higher gusts. Bill is a category four hurricane on the Saffir-Simpson scale. Some additional strengthening is possible during the next couple of days.

Bill is a large Tropical Cyclone. Hurricane force winds extend outward up to 85 miles (140 km) from the center and Tropical Storm force winds extend outward up to 230 miles (370 km). The latest minimum central pressure reported by an Air Force reserve hurricane hunter aircraft was 947 mb (27.96 inches).

Large swells associated with Bill will be impacting the islands of the northeast Caribbean Sea during the next day or two. Large swells associated with Bill should also begin to affect Bermuda and portions of the Eastern Coast of the United States Friday and Saturday.

Hurricane Bill Strengthens to Category 4 Storm

17.3N 56.2W

August 19th, 2009 Category: Tropical Storms

Hurricane Bill - August 19th, 2009 © Univ. of Wisconsin

Hurricane Bill - August 19th, 2009

Sea Surface Temperature around Bill - August 19th, 2009 © Univ. of Wisconsin

Sea Surface Temperature around Bill - August 19th, 2009

Bill (02L) has strengthened to a Category Four Hurricane, whose center is located about 460 miles (740 km) east of the Leeward Islands.

Bill is moving toward the west-northwest near 16 mph (26 km/hr) and a gradual turn toward the northwest is expected during the next 24 to 48  hours. On this track, the core of this dangerous hurricane will be passing well to the northeast of the northern Leeward Islands late today and early Thursday.

The animated image shows the movement of Bill today and its well-developed eye. The still image, on the other hand, shows the temperatures of the Atlantic Ocean and the past and forecast track of the hurricane, which is expected to move northwest towards warmer waters.

Maximum sustained winds are near 135 mph (215 km/hr) with higher gusts. Bill is a category four hurricane on the Saffir-Simpson scale, with some additional strengthening forecast during the next 24 hours.

Hurricane force winds extend outward up to 45 miles (75 km) from the center, and tropical storm force winds extend outward up to 175 miles (280 km). The estimated minimum central pressure is 948 mb (27.99 inches).

Large swells associated with Bill will be impacting the islands of the northeast Caribbean Sea during the next day or two. Large swells associated with Bill should also begin to affect Bermuda and portions of the southeastern coast of the United States Friday and Saturday.

Hurricane Bill Strengthening

14.1N 45.2W

August 17th, 2009 Category: Tropical Storms

Hurricane Bill - August 17th, 2009

Hurricane Bill - August 17th, 2009

Enhanced image

Enhanced image

Track of Bill - August 17th, 2009 © Univ. of Wisconsin

Track of Bill

Hurricane Bill is strengthening as it continues moving west-northwestward.
At 1100 am AST (1500 UTC) the center of Hurricane Bill was located near latitude 14.1 north longitude 45.2 West or about 1080 miles (1735 km) East of the Lesser Antilles.

Hurricane Bill is moving toward the west-northwest near 16 mph (26 km/h) and this motion is expected to continue for the next couple of days.

Maximum sustained winds have increased to near 90 mph 150 km/h with higher gusts. Some strengthening is forecast during the next 48 hours and Hurricane Bill could become a major hurricane by Wednesday.

Hurricane force winds extend outward up to 30 miles (45 km) from the center and tropical storm force winds extend outward up to 145 miles (230 km). The estimated minimum central pressure is 977 mb (28.85 inches).

Tropical Storm Bill (02L) East of Lesser Antilles

12.5N 47.8W

August 17th, 2009 Category: Tropical Storms

Tropical Storm Bill - August 15th, 2009

Tropical Storm Bill - August 15th, 2009

Enhanced image

Enhanced image

Track of Bill - August 17th, 2009 © Univ. of Wisconsin

Track of Bill

As of 11 p.m. AST August 16 (0300 UTC August 17), Tropical Storm Bill (02L) was located within 30 nautical miles of 12.8°N 40.0°W, about 1320 mi (2120 km) east of the Lesser Antilles.

As of 0900 UTC, maximum sustained winds were 65 knots with gusts to 80 knots. Minimum central pressure was 987 mbar, and the system was moving west-northwest at 19 knots.

Bill began forming late on August 12, as a strong tropical wave associated with an area of low pressure moved off of the African coast with deep layers of moisture observed. Later that day, the wave became better organized with a low level circulation forming, but without any significant convection. That night, the area of convection became more concentrated, but wind shear increased since the previous advisory.

On August 14, the disturbance strengthened more and its convective bands became stronger with better circulation, and the NHC soon upgraded it to a tropical depression, the third of the year. Later, on August 15, even though some of its deep convection dissipated, it was officially named Bill, the second named storm of the year.

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