On May 8, 2009, parts of Southern Illinois were hit by a super derecho.
At the time, that term was nearly unheard of.
In weather terms, a derecho, from a Spanish word meaning straight, is a widespread and relatively lengthy windstorm accompanied by a band of fast-moving showers or thunderstorms.
According to information provided by the National Weather Service in Paducah, the system had an unusually large bookend vortex, some 30 to 40 nautical miles, or approximately 34 to 46 miles, in diameter, whereas the average vortex is only 12 nautical miles in diameter.
Peak wind gusts were measured at 81 mph in Carbondale before the automated system died, while 106 mph winds were measured on a different instrument.
Here's a look back at the historic storm and its aftermath.