The California wildfires, by the numbers

The sun shines above behind a burning building at the Hilton Sonoma Wine Country hotel in Santa Rosa Monday. Photo: Jeff Chiu / AP

Since more than a dozen wildfires started ripping northern California Sunday night, at least 15 people have died, more than 20,000 have evacuated, and at least 2,000 homes have been destroyed, according to the Washington Post. According to CNN, 20,000 acres of land were torched in 12 hours, putting the fires' advancement "at a rate of more than a football field every 3 seconds." President Trump approved Gov. Jerry Brown's request for federal assistance.

Why the blazes are spreading so quickly: Dry conditions, low humidity, and high winds, according to California's Department of Forestry and Fire Protection. The California winter was fairly wet, but vegetation still hasn't bounced back entirely from the drought. Part of the problem is the winds, which have gone up to 50-70mph in the blazes, are causing spot fires ahead of the fire line, per the LA Times.