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The most severe blizzards in American history were deadly and powerful.

The National Weather Service defines a blizzard as an event with 35 mile-per-hour winds and heavy snowfall. A ground blizzard, in which already-fallen snow is blown about by strong winds, can happen beneath sunny skies. In the Lower 48 states, blizzard conditions occur most frequently in the Plains and Northeast. The most severe blizzards in U.S. history have killed dozens, or even hundreds. These are five of the worst storms to have struck the country; read on for more details.