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LAS VEGAS, NV - SEPTEMBER 13: Lightning flashes over hotel-casinos in downtown Las Vegas during a thunderstorm early on September 13, 2011 in Las Vegas, Nevada. Stormy weather is expected to continue through Thursday. (Photo by Ethan Miller/Getty Images)

LAS VEGAS, NV - SEPTEMBER 13:  Lightning flashes over hotel-casinos in downtown Las Vegas during a thunderstorm early on September 13, 2011 in Las Vegas, Nevada. Stormy weather is expected to continue through Thursday.  (Photo by Ethan Miller/Getty Images)