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In this photo provided by Gothamist, dark clouds loom over the skyline, Saturday, Sept. 8, 2012, in New York. Two tornadoes struck New York City on Saturday, one swept out of the sea and hit a beachfront neighborhood and the second, stronger twister hit moments later, hurling debris in the air, knocking out power and startling residents who once thought of twisters as a Midwestern phenomenon. (AP Photo/Gothamist, Jake Dobkin) MANDATORY CREDIT

Twisters slam NYC

A rare tornado struck New York City on Sept. 8, blowing out the windows of at least one building, and a separate twister hit the Virginia suburbs of Washington, D.C., as a line of fierce thunderstorms swept the region, knocking out power to thousands of homes.