Snowstorms like the historic blizzard that lashed the East Coast this weekend may be more numerous than they used to be. The number of blizzards each year has doubled in the past two decades, according to preliminary research by geographer Jill Coleman at Ball State University in Muncie, Ind. From 1960-94, the United States averaged about nine blizzards per year. But since 1995, the average is 19 blizzards a year, she said.
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