A Red Flag Warning remained active for inland and mountain communities through Friday morning, which means it could be another busy day for local fire crews.

High fire danger warnings have been a recurring theme for Los Angeles in January. Here's a look at how many red flag warnings were issued this month.

The National Weather Service issued red flag warnings until Friday morning for inland valleys and mountain areas.

"A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly," the NWS said.

A critical fire threat will continue across County as Santa Ana winds and dry conditions persist through early Friday, according to the National Weather Service.

Santa Ana winds picked up across San Diego County Monday, prompting a red flag warning for the most wind-prone areas and power shut-offs for some San Diego Gas & Electric customers.

Another blast of Santa Ana winds Thursday prompted San Diego Gas & Electric to cut off electricity to thousands of residents in another of a wave of power outages that have continued off and on for two weeks.

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

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

Numerous wildfires have ignited in southern California this month, killing at least 27 people and spanning thousands of acres.

The Sepulveda fire was the latest blaze in a nerve-racking week as Southern California headed into a fourth consecutive day of red flag fire weather warnings. The alerts caution that conditions are ripe for fires to ignite and spread rapidly.