Tens of thousands of people have fled their homes as a brush fire in the Pacific Palisades has grown to nearly 20,000 acres on Thursday.

The gusty winds that helped spread multiple wildfires gradually subsided on Wednesday afternoon, but dry conditions mean less potent winds could still be dangerous. More strong winds are expected later Thursday.

By the time the winds get to the point where the Eaton Fire broke out in Altadena on Jan. 7, it’s not uncommon for them to have less than 5 percent relative humidity, meaning essentially no moisture at all.