Californians in the greater Los Angeles area have been on edge due to high winds and dry conditions. The Palisades and Eaton fires have killed at least 25 and destroyed thousands of homes.

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.

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. Swaths of Los Angeles County, and most of Ventura County, are at the highest risk.

Here's a guide to understanding "particularly dangerous situation" red flag warnings, containment, and other terms related to the devastating fires that have left much of the LA area in ruins.

With the PDS warning, officials said Monday that residents should be prepared to leave immediately as the critical fire danger weather ramps up.

Southern California is heading into a day of its most extreme fire weather conditions — an unprecedented fifth time the National Weather Service office has sounded the alarm this season of a “particularly dangerous situation.

Another “potentially dangerous situation red flag warning” hit Monday afternoon, Jan. 20, as fire crews brace for the potential of new wildfires during troubling winds while still working to contain two of the most devastating fires in the history of Los Angeles County.