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Blizzards Are Defined by 3 Conditions.

Blizzards are common in many parts of the United States. But what makes a snowstorm a blizzard? Falling snow (or snow that’s already on the ground being blown around), visibility that is reduced to a quarter of a mile or less (caused by the falling or blowing snow), and windspeeds of 35 mph or more are the 3 conditions used by the National Weather Service to define a blizzard.

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