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chapter%2014%2c%20rauber - Chapter 14, Rauber Great Plains...

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Chapter 14, Rauber – Great Plains Blizzards I. Great Plains blizzards A. Definition of a blizzard: Winds greater than or equal to 30kts (35mph); falling or blowing snow; visibility less than ¼ mile for 3 hours or more. B. Many blizzards in Great Plains of USA due to unique geography: 1. Relatively flat terrain from Canada to Gulf of Mexico with mountain ranges in east (Appalachians) and west (Rockies). 2. Cold air from Canada mixes with moisture from the Gulf of Mexico thanks to extratropical cyclones that form east of the Rockies (air is blowing into the cyclone/low). 3. Probability of occurrence of a blizzard (not necessarily in the Great Plains): 1
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4. States most likely to have blizzards are: North and South Dakota, Minnesota, Nebraska, northern Iowa, and eastern Colorado. 5. Blizzards by County (1959-2000) 2
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maps? 6. Canadian provinces most likely to have blizzards are: Alberta, Saskatchewan, and Manitoba. B. More on cold core highs (which you should know about by now): 1. Cold core highs are induced by cold temps. on the ground and a snow-covered ground is
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chapter%2014%2c%20rauber - Chapter 14, Rauber Great Plains...

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