Meteorological Analysis
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Bill originated from a nontropical upper level low which separated from a
mid oceanic trough in early July. By July 7th convection increased with the
upper low and a surface trough formed under the upper low. Shear was too
high for the surface trough to organize however. The upper low causing the
shear then moved into the Caribbean, allowing the surface low to organize
convection. As the surface low approached the Bahamas on the 11th it gained
enough organization to be considered a tropical depression. The depression
then began to accelerate NE ahead of a trough approaching from the U.S., and
became tropical storm Bill later on the 11th. Bill continued to strengthen and
reached its maximum intensity of 75 mph, making Bill a hurricane. This was in
spite of the cool waters Bill was moving over. Bill then began to weaken as
shear impacted the storm from the approaching front, and by the 13th the front
completely absorbed Bill.
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Casualty and Damage Overview
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There are no reports of casualties or damage in association with Bill.
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Bill Hurricane Research Division Products
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Imagery
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Tracking Data
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Hurricane Bill
Time Lat Lon Wind(mph) Pressure Storm type
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6 GMT 07/11/97 30.4N 69.9W 35 1014 Tropical Depression
12 GMT 07/11/97 31.8N 68.9W 45 1013 Tropical Storm
18 GMT 07/11/97 33.1N 67.6W 50 1010 Tropical Storm
0 GMT 07/12/97 34.7N 65.8W 60 1005 Tropical Storm
6 GMT 07/12/97 36.3N 63.6W 70 995 Tropical Storm
12 GMT 07/12/97 37.9N 61.1W 75 987 Category 1 Hurricane
18 GMT 07/12/97 39.6N 58.4W 75 987 Category 1 Hurricane
0 GMT 07/13/97 41.6N 55.4W 70 990 Tropical Storm
6 GMT 07/13/97 44.0N 53.0W 45 990 Tropical Storm
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Tracking maps courtesy of NHC
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Selected Satellite Image
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