By Stanley A. Changnon
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S. windstorms were caused by extratropical storms and 30 percent by thunderstorm winds. In the west, 78 percent of all storms were generated by Pacific lows and 18 percent by mountain ranges. Point storm durations were mainly three minutes or less in 85 percent of all the nation’s windstorms, whereas 12 percent lasted one hour or longer at a point. S. 9 events in the West. The longest durations in the West came along the Pacific Coast, and the longest average point durations in the East were in the Northeast.
E. Kunkel. 2006. Severe Storms in the Midwest. Illinois State Water Survey Informational/Education Material 2006-02, Champaign, IL, 74pp. , and J. Hewings. 2001. Losses from weather extremes in the United States. Natural Hazards Review 2:113-123. A. 2009. S. Climatic Change 94:473-482. National Research Council. 1999. The Costs of Natural Disasters: A Framework for Assessment. National Academy of Science, Washington, DC, 56pp. Property Claims Service (PCS). 2007. The catastrophe record for 2006.
In contrast, the average storm loss in the adjacent regions, the High Plains, is only $42 million. Windstorm catastrophes are most frequent in the Northeast, Central, Northwest, and West regions. Nationally, the average catastrophe loss is $90 million, and annually, the average nationwide loss from windstorm catastrophes is $283 million. An adjustment of this value for uninsured property losses and those from insured losses from events causing less than catastrophes ($1 million) raises the annual loss total to an estimated $311 million.
An Atlas of Windstorms in the United States and Their Impacts by Stanley A. Changnon