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What is the basis for these three classes ( ≥ 40 mph; ≥ 75 mph; ≥ 115 mph) of high wind probabilities?

April 26, 2017basis classes high MPH probabilities wind

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What is the basis for these three classes ( ≥ 40 mph; ≥ 75 mph; ≥ 115 mph) of high wind probabilities?

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They are derived from data on all tropical cyclone US landfalls of the 20th Century along with combined wind assumptions of the radial distribution of wind strength with cyclone intensity. Cyclone intensity was determined by a combination of maximum sustained wind and minimum central pressure at landfall.