The rapidly growing wildfire, aided by hot, windy, and dry weather, drought, and beetle-killed timber, created a pyrocumulonimbus cloud. According to NASA, it is the largest such cloud ever seen in the United States.
A wildfire that was growing quickly due to hot, windy, dry weather, drought, and beetle-killed trees created a massive pyrocumulonimbus cloud.  According to NASA, this is the biggest such cloud ever seen in the United States.