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.

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.

NWS' 3:40 a.m. advisory indicates winds were blowing northeast at speeds between 25 to 35 mph, with gusts up to 60 mph.

Nearly 100,000 San Diegans could loose power during the next round of power shutoffs after the National Weather Service issued another Red Flag Warning for the region for Monday and Tuesday as Santa Ana winds return.

This weekend's cool temperatures and higher humidity are expected to give way to more Santa Anas and a new red flag warning Monday.

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

SAN DIEGO (FOX 5/KUSI) — 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 ...

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.

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

The National Weather Service warned: "Unfortunately, dangerous fire weather conditions look to continue through at least mid-week."

Forecasters say a "moderate to strong'' Santa Ana wind event is expected, with isolated gusts of 80 to 100 mph expected in most wind-prone mountain locations, such as the San Gabriel, western Santa Monica and Santa Susana Mountains, according to the NWS.