Firefighters scrambled Sunday to make further progress against wildfires that have destroyed thousands of homes and killed 24 people in the Los Angeles area as forecasters again warned of dangerous weather with the return of strong winds this week. At least 16 people were missing, and authorities said that number was expected to rise.

The National Weather Service issued red flag warnings for severe fire conditions through Wednesday, with sustained winds of 50 mph (80 kph) and gusts in the mountains reaching 70 mph (113 kph). The most dangerous day will be Tuesday, said weather service meteorologist Rich Thompson.

“You’re going to have really strong gusty Santa Ana winds, a very dry atmosphere and still very dry brush, so we still have some very critical fire weather conditions out there,” Thompson said at a community meeting Saturday night.

Los Angeles County Fire Chief Anthony C. Marrone said 70 additional water trucks arrived to help firefighters fend off flames spread by renewed gusts. “We are prepared for the upcoming wind event,” Marrone said. Fire retardant dropped by aircraft Sunday will act as a barrier along hillsides, officials said.

Fierce Santa Anas have been largely blamed for turning the wildfires sparked last week into infernos that leveled entireneighborhoodsaround the city where there has been no significant rainfall in more thaneight months.