"Fires at night"
The King Fire burns through the El Dorado National Forest on September 20th, 2014. The fire burned 50,000 acres of forest overnight and killed most vegetation in it's path. The pyrocumulus cloud could be seen from Sacramento and the California Central Valley.
The King Fire's spread overnight is one of the fastest spreads of fire on record, according to veteran firefighters.
(correct date is Sept. 19, 2014)