A tornado passes near Ryan Ranch subdivision in southern Denton County, Texas.
A tornado passes near Ryan Ranch subdivision in southern Denton County, Texas. Randall N. Lantz/Dallas Morning News/MCT
A tornado passes near Ryan Ranch subdivision in southern Denton County, Texas. Randall N. Lantz/Dallas Morning News/MCT

National

May 25, 2011 5:51 PM

Extreme weather's frequency to increase

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