Dangerous conditions are expected to persist through Friday before flame-fanning winds subside slightly, potentially giving crews a foothold against infernos that have killed at least 10 people.

Fierce winds fueled new fires and made it harder to contain the largest blazes, which have destroyed whole neighborhoods and have become some of the most devastating in California’s history.

A new fire — the Kenneth Fire — erupted Thursday afternoon, so far spreading across 960 acres in Los Angeles and Ventura counties. The California Department of Forestry and Fire Protection says that blaze is 0% contained.