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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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