This week, the Santa Ana winds are expected to hit the region, possibly sparking more fires in Los Angeles, Orange, Riverside, San Bernardino and/or Ventura counties. The National Weather Service declared a rare PDS, or "particularly dangerous situation," red flag warning for the Los Angeles area ahead of this week.

A critical fire threat will continue across County as Santa Ana winds and dry conditions persist through early Friday, according to the National Weather Service.

Southern California will continue to face "dangerous fire weather conditions" including strong Santa Ana winds and extremely low humidity through later this week, forecasters said Tuesday.

Critical fire conditions are expected to continue through Friday. But rain could be on the way this weekend. Here's what to know.

Not only do these winds accelerate the speed and spread of the fires, they also affect how the fires are fought. The strong winds can make it dangerous to fly aircraft used for containing the fires.

San Diego County remains under the grip of another round of moderate to strong Santa Ana winds, paired with extremely dry air, elevating critical fire weather concerns.

The Santa Anas are expected to be most powerful Monday night into Tuesday. Fire services across the region say they are ready.

Much of inland San Diego County was whipped yet again by a strong Santa Ana wind event Monday into Tuesday, contributing to risky fire conditions as the region remains bone-dry.

Much of fire ravaged southern California is under a flood watch after devastating flames have left thousands of acres barren and vulnerable to flash flooding, land and mudslides with rain in the forecast.

The evacuation area for the Border 2 fire stretches east to state Route 94 and west to Lower Otay Lake, warnings issued for southwest side of lake.

Firefighters made progress on the more than 10,000-acre Hughes Fire Friday, which sent thousands fleeing after sparking near the Los Angeles County community of Castaic a day earlier.