On September 19, the combination of strong winds and dry air ignited dangerous fires in parts of Utah. The Twitchell Canyon Fire is the largest. It seared through conifer and juniper forests in the mountains of central Utah, but didn't threaten any populated parts of the state. It began because of a lightening strike on July 20.
The second largest fire, the Coffee Pot Fire, burned in Coffee Pot Canyon in the Manti-La Sal National Forest. A lightening strike lit it up on July 17.
The Machine Gun Fire, which was sparked from ammunition during a National Guard exercise on September 19, flared near the city of Herriman. According to CNN, it has destroyed at least three homes and forced roughly 1,600 families to evacuate.