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The technical definition of a blizzard is for these conditions (> 35mph winds, snow/blowing snow, and < 1/4 mi vis) for 3 hours. You can clearly have blizzard-like conditions for a half-hour in a snow squall - but it not technically be a blizzard. Otherwise we'll overuse Blizzard warnings. This happens quite a bit in the higher (exposed) passes of Colorado.
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