A "particularly dangerous situation warning'' has been issued for L.A. and Ventura counties due to dangerous winds and very low humidity.

Even as Santa Ana winds continued to blast parts of the Southland, helping to fuel a new brush fire in the Castaic area, local authorities turned their attention Wednesday to the possibility of rain hitting the area this weekend and potentially triggering mud or debris flows in recent burn areas.

An arson suspect was arrested in connection to a brush fire in Griffith Park after firefighters quickly put out the small blaze.

With the Palisades and Eaton Fires still not fully contained, another dangerous Santa Ana wind event is forecast in Los Angeles for Monday-Thursday.

Gusts of up to 70 mph are possible along the coast and valleys, and in the mountains, up to 100 mph, the National Weather Service said. Parts of L.A. County, and most of Ventura County, are at highest risk.

Santa Ana winds returned to the Los Angeles area on Tuesday, threatening to reverse progress made in the battle against deadly wildfires.

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

More Santa Ana winds blew into Southern California Monday, again raising wildfire danger even as crews continued their efforts to fully contain a pair of massive blazes that erupted amid erratic winds earlier this month,

Santa Ana winds are hot, dry winds that blow in from the northeast. They pick up speed as they hit the mountains around LA, and send humidity levels plunging, further upping the fire risk.

Forecasters in Southern California expect to issue a 'particularly dangerous situation' red flag warning for the coming week as the Santa Ana wind forecast worsens.

The spiking levels underscore the added danger from wildfires when cars, homes, and other structures burn, researchers said. Lead is often present in paint and pipes used in older homes, while chlorine and other chemicals are generated when plastic melts or combusts.

The Santa Ana winds are dry, powerful winds that blow down the mountains toward the Southern California coast. The region sees about 10 Santa Ana wind events a year on average, typically occurring from fall into January. When conditions are dry, as they are right now, these winds can become a severe fire hazard.