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What can cause the kind of drastic... | Almanac.com

What can cause the kind of drastic...

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What can cause the kind of drastic weather change that occurred in South Dakota in 1943, when within two minutes temperatures went from 49 degrees F to -2 degrees F?
These kinds of changes usually are brought about by chinook winds that blow down the eastern slopes of the Rocky Mountains over the adjacent plains in the U.S. and Canada.

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