When meteorologists say derecho, they are referring to a widespread, long-lived wind storm associated with bands of fast-moving thunderstorms. To qualify as a derecho, a storm must cause damage over a 240-mile front/line and produce wind gusts of at least 58 miles per hour. When a derecho barreled over the eastern US in June 2012, the impacts were severe. That powerful storm brought hurricane-force winds to numerous states, killed 22 people, and knocked out electric power for millions. So people were bracing for the worst when a fierce line of storms was bearing down on the same area on June 13, 2013. While the 2013 storm was not as powerful as the previous year's event, the NWS said it still qualified as a "low-end derecho". Over a 15-hour period, the storm system generated 376 reports of damaging thunderstorm wind. In one part of Indiana, a storm cell brought winds of 90-100 miles per hour across an area seven miles long and three miles wide. NASA's MODIS acquired this true-color image of the storm system on June 13.