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

Katabatic winds? Adiabatic compression? Time for a thermodynamics lesson! The record lack of rain has also made this Santa Ana event different.

The Palisades and Eaton wildfires also continue burning in the Los Angeles area, leaving parts of Southern California with devastating fire damage.

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.

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

Firefighters in Southern California are once again battling a wildfire, this time in Castaic in Los Angeles County, north of Los Angeles itself. Evacuation orders have been issued for the surrounding areas.

The Santa Ana winds fanning wildfires that have killed at least 25 people in Southern California and destroyed more than 10,000 houses, businesses and other structures in Greater Los Angeles are flaring up again.

California Governor Gavin Newsom has deployed fire engines, water-dropping aircraft and hand crews across the region—to enable a rapid response if a new fire does break out, according to The Associated Press.

As winds across the Southern California area are calmer than their peak and firefighters are making progress, the threat to the fire-weary region remains with Santa Ana winds expected to continue in the coming days.

The National Weather Service has issued another rare Particularly Dangerous Situation warning in anticipation of Monday's Santa Ana wind event.

A particularly dangerous situation red flag warning is in place from noon Monday to 10 a.m. Tuesday local time for a large portion of Ventura and Los Angeles counties.