The two biggest wildfires ravaging the Los Angeles area have killed at least 10 people and burned more than 10,000 homes and other structures, officials said as they urged more people to heed evacuation orders after a new blaze ignited and quickly grew.

“While we are still facing significant threats, I am hopeful that the tide is turning,” Los Angeles County Supervisor Kathryn Barger said during a news conference Thursday morning. Water dropped from aircraft helped fire crews quickly seize control of the fires in the Hollywood Hills and Studio City, Los Angeles Mayor Karen Bass said. Much of the widespread destruction around the city occurred Tuesday after those aircraft were grounded due to high winds.

Flames were being pushed by Santa Ana winds topping 60 mph (97 kph) in some places Tuesday, increasing to 80 mph (129 kph) by early Wednesday, according to reports received by the National Weather Service. They could top 100 mph (160 kph) in mountains and foothills — including in areas that haven’t seen substantial rain in months.