None of the Los Angeles County fires that have killed at least 10 people are among California's 20 largest wildfires, but they're among the most destructive on record as they burned more structures overnight.

The most destructive wildfires in Los Angeles history Thursday have burned more than 27,000 acres, destroyed 1,000 structures, killed five people and upended the lives of tens of thousands of people forced to flee.

With strong winds, dry conditions and no immediate end in sight, analysts project total economic losses of $50 billion to $150 billion.