A red flag warning for critical fire danger, due to strong winds and low humidity, will remain in effect until 6 p.m. Wednesday for the San Diego County mountains and inland valleys.

The National Weather Service issued red flag warnings for severe fire conditions. Winds could reach 65 mph, the NWS warned. NewsNation senior national correspondent Brian Entin shares the latest details.

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.