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

Multiple counties in Southern California were under red flag warnings from the NWS early Monday, with the service warning of yet another round of Santa Ana winds.

In recent days, however, the region’s powerful Santa Ana winds—which have been fanning the flames—have begun to slow down. This lull has offered firefighters a reprieve and a key opportunity to make progress against the blazes, but forecasts suggest the Santa Ana will return next week. What are these gusts, and how have they become so strong?

Santa Ana winds in Southern California are often-fierce winds that topple power lines and trees and can turn a spark into a raging wildfire.

The ferocious Santa Ana winds that helped fuel the deadly wildfires around Los Angeles are forecast to ease later Wednesday, but they may return.

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

National Weather Service offices across Southern California are warning residents of an increase in weather conditions that are conducive to rapid fire growth. Meteorologists are most concerned about conditions from Monday afternoon through Wednesday morning when winds will be at their peak and relative humidity will be low.

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

The latest Santa Ana winds will return Monday, with the strongest gusts expected Monday night into Tuesday morning, as Los Angeles fires continue to burn.

On Saturday at 8:57 p.m. the NWS San Diego CA issued a high wind watch valid from Monday 8 p.m. until Tuesday 8 p.m. The watch is for San Bernardino and Riverside County Valleys-The Inland Empire, San Bernardino County Mountains,

Firefighters made progress battling back the deadly Los Angeles blazes overnight into Saturday, Jan, 18. as President-elect Donald Trump said he likely will visit the fire-torn areas next week. “I will be, probably, at the end of the week,” Trump told NBC News in an interview on Saturday.