As snow fell in Rapid City, S.D., Friday Brenda Nolting took groceries to her car. An early snow storm swept through Wyoming and western South Dakota, dropping more than two fee of snow in some areas. Steve McEnroe/AP hide caption

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A man walks across the washed-out Wagonwheel Gap Road in Boulder, Colo., on Monday. Mark Leffingwell /Reuters/Landov hide caption

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John Hoffenberg watches as floodwaters flow down a street in Boulder, Colo., on Sunday. Mark Leffingwell/Reuters/Landov hide caption

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People cool off Wednesday in a pool in Shanghai, where temperatures reached an all-time record: 105.4 degrees. Frank Langfitt/NPR hide caption

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Excessive heat warnings will continue for much of the Desert Southwest through Monday. Here, Maria Wieser of Italy drinks water while sightseeing in Death Valley National Park on Friday. Chris Carlson/AP hide caption

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Quite a show in Chicago: Lightning struck the Willis Tower (formerly the Sears Tower, at right) on Wednesday as the storm system moved through. Scott Olson/Getty Images hide caption

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A map shows the chance of severe thunderstorms Wednesday evening, with the National Weather Service predicting strong winds and storms moving eastward to the mid-Atlantic Thursday. NOAA hide caption

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