What to Know The red flag warning went into effect at 3 a.m. Friday and was scheduled to expire at 10 p.m.

Wind gusts up to 45 mph are possible in mountain areas

Humidity levels will increase during the weekend

Firefighters extinguished a brush fire near Elysian Park ahead of a day of high fire danger in parts of Southern California.

Firefighters were called at about 11:30 p.m. Thursday to 1340 N. Stadium Way and located the blaze, which burned about an acre of vegetation, according to Amy Bastman of the Los Angeles Fire Department. A knockdown was declared at 12:35 a.m, she said.

No injuries were reported and the cause of the fire was under investigation.

A red flag warning signifying a high risk of wildfire was in effect in Los Angeles and Orange counties Friday because of strong Santa Ana winds and low humidity. Wind gusts of between 30 and 45 miles per hour are expected in Los Angeles and Ventura counties at the height of the wind amid humidity levels of 10-15 percent at lower elevations.

The humidity will increase Saturday and Sunday.

The red flag warning went into effect at 3 a.m. Friday and was scheduled to expire at 10 p.m. It was issued for the San Gabriel Mountains, the Angeles National Forest, the Santa Monica Mountains Recreational Area and forest and mountain areas of Ventura County. Northeast-to-east winds of 15 to 30 miles per hour with 45-mile-per-hour gusts are expected in mountain areas.

"We have that picking up right around the lunch-time hour," said NBC4 forecaster Shanna Mendiola.

The red flag warning was also in effect in the San Fernando, Santa Clarita and San Gabriel valleys, Los Angeles County beach cities, metropolitan Los Angeles, Downtown L.A. and the Hollywood Hills, with winds of 10-25 mph forecast in those areas, along with 35-mph gusts and humidity levels of 10-15 percent.

Temperatures will remain warm through Saturday.

"We'll start to cool down Sunday and stay that way through the first part of the week," Mendiola said.