On the evening of June 30, 2014, a derecho swept across Chicago. A derecho is a widespread, long-lived windstorm driven by a line of fast-moving thunderstorms. This time-lapse highlight reel of the storm captures a triple lightning strike, with bolts hitting three of the city's tallest buildings at once. Tall buildings with lightning protection are struck repeatedly and safely carry the current to ground.
via Derecho | Wikipedia