Red flag criteria is generally when relative humidity is at 15% or less, combined with sustained winds and/or gusts of 25 mph or greater. Both of these conditions must occur simultaneously for at least 3 hours in a 12 hour period, according to the NWS.

"If fire ignition occurs, conditions are favorable for very rapid fire spread and extreme fire behavior," the NWS warns.

As firefighters struggle to gain control of massive and deadly wildfires that are raging across parts of the Los Angeles area, the region is once again bracing for the potential of new fires and for current ones to intensify as a new storm system heads for the state.

The latest red flag warning includes the Inland Empire and Orange County, as well as the already ravaged Los Angeles area.

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.

A red flag warning has been issued for the Inland Empire and some cities in the Coachella Valley as strong gusty winds and low humidity are expected early next week. The warning is in effect from 10 a.

Nearly 100,000 San Diegans could lose power during the next round of power shutoffs after the National Weather Service issued another Red Flag Warning for the region as Santa Ana winds return. A Red Flag Warning will go into effect from 10 a.

As wildfires rage near Los Angeles, claiming lives and homes, residents cling to hope for a wind shift. With damages projected to reach up to $275 billion, the devastation is immense, but a change in weather may offer a glimmer of relief amidst the chaos.

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.

The National Weather Service issued a Red Flag Warning starting Monday for San Diego County's inland valleys and mountains.

A red flag warning will remain in effect for a smaller portion of L.A. and Ventura counties through 3 p.m. Thursday, including the Grapevine section of Interstate 5, the western San Gabriel ...

A red flag warning is issued by meteorologists when environmental conditions are favorable for rapid fire spread. Typically, this means winds must be at least 35 miles per hour, the relative ...