'Fire devils' spotted as California fire doubles in size

Thousands of firefighters have been battling a rapidly growing wildfire in northern California, scorching an area nearly the size of Los Angeles.

When a blaze becomes sufficiently large and hot, it generates massive towers of swirling air. This column begins to spin, drawing in dirt, debris, and fire, creating the appearance of a fire tornado, known as "fire devils."

Cooler temperatures are expected to help slow the Park Fire, the largest blaze in California this year.