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Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley over the downtown Salt Lake City Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley on Sunday, Aug. 28, 2011. Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley, as seen from The Gateway mall in Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley, as seen from The Gateway mall in Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley, as seen from The Gateway mall in Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley, as seen from The Gateway mall in Lennie Mahler | The Salt Lake Tribune A thunderstorm makes its way across the Salt Lake Valley over the downtown skyline on Sund