The red-flag warning extended Wednesday for the county’s inland valleys still is set to expire at 6 p.m. Friday, with overnight northeast winds of 28 to 38 mph and possible gusts of 50 mph, up to 60 mph after midnight.

A "Particularly Dangerous Situation" warning remains in effect as strong winds cause extreme fire danger in Southern California.

Since last week, numerous fires have sparked in the Los Angeles area as Santa Ana winds gusted through the region.

After extreme winds gusts helped fan the flames of the Palisades and Eaton fires last week, a Red Flag Warning is once again in effect.

That’s leading to the creation of mountain waves, which arise when strong winds blow perpendicular to a mountain range. The waves shoot down the coastal side of the mountains, gaining speed along the way, and are more casually referred to as simple Santa Ana winds.

The winds fueling Southern California wildfires form when a high-pressure system develops over the Great Basin in Utah and Nevada

National Weather Service (NWS) meteorologists are confident that the ongoing red flag warnings will expire either Wednesday night or Thursday afternoon after being issued or extended multiple times as wildfires continue burning in Southern California.

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

Extreme fire weather remains in the Southern California region as high winds have prompted a "Particularly Dangerous Situation" red flag warning,​ weather officials say.

The National Weather Service has issued a Red Flag Warning for most of San Diego County amid another round of Santa Ana winds.

Dry Santa Ana winds are expected to peak early Tuesday morning in the Santa Clarita Valley, bringing dangerous fire conditions to the area.