Tuesday, August 18, 2009

Hurrricane Bill (2009)

Storm Active; August 15-24

On August 11, a strong tropical wave moved off Africa. It took a few days to organize, but on August 15, it became Tropical Depression Three, with 35 mph winds and a pressure of 1006 millibars. A few hours later, Three became Tropical Storm Bill. Unlike the previous storm Ana, Bill quickly stregthened and became the first hurricane of the 2009 season on August 17 with 75 mph winds and a pressure of 987 millibars. It took a west-north-west track, which allowed for more favorable conditions. Inside the well-organized circulation, eyewall and eye structures quickly formed. A large area of high pressure kept Bill on this track, as it continued to gain strength. By August 18, it was a Category 2, with 100 mph winds and a pressure of 967 millibars. Then, overnight, Bill rapidly intensified into a Category 4 hurricane, with winds of 135 mph and a pressure of 948 millibars. Later that same day, Bill made its closest approach to the northeasternmost islands of the Caribbean, causing high surf but no other effects. On August 20, the ridge of high pressure keeping Bill to the south weakened, allowing Bill to take a northward turn. Bill slowly weakened, and on August 21, began to batter Bermuda with tropical storm force winds as a Category 2. Bill continued north, accelerating over time, and brushed Cape Cod with its outer bands causing huge surf and rip currents. On August 23, Bill's center paralleled the coast of Nova Scotia, staying barely offshore. At this time, Bill was turning east and was a minimal Category 1 hurricane. Late that night Bill made a landfall in Newfoundland and had passed by a mere six hours later. Early on August 24, Bill was a tropical storm, and, going east at 43 mph, Bill finally became extratropical. It continued eastward, and its extratropical remnants eventually brought wind and rain to Great Britain and surrounding areas. Bill caused two fatalities, both as a result of high surf on the east coast of the U.S.

Sorry, but an image of Hurricane Bill is not currently available on this website. To see one, click here.

Track of Bill.

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