Red flag warnings were in force until Tuesday in the Santa Monica Mountains and Santa Clarita and San Fernando valleys, the foothills of the San Gabriel Valley and along the coast, in beach cities.

“Very low relative humidity, coupled with the strong and gusty winds will pose a critical fire weather threat”, forecasters said.

The east to northeast winds are expected to start late Sunday night and will blow around 25 to 35 miles per hour with gusts of up to 55 miles per hour, according to NWS.

Those conditions should continue through Monday evening, and then the winds will start to weaken, the red flag warning says. The NWS expects the humidity level to pick up Tuesday night into Wednesday.

Downed trees and high winds took their toll on valley areas Monday.

The Santa Ana Mountains, including Anaheim canyon, were added to the affected are as well, with winds predicted to arrive around 3 a.m., spreading to coastal Orange County by 6.

The threat was high in Los Angeles and Ventura counties, meaning that potential fires in those regions “will grow very rapidly, will burn intensely, and will be very hard to control”.

Because of the increased fire danger Monday, the San Diego Fire-Rescue Department put five extra brush engines, two extra water tenders and more than 20 extra firefighters on duty to help battle any potential wildfires.