Red flag warnings for fire danger are in effect for parts of Southern California due to gusty Santa Ana winds and low relative humidity levels, the National Weather Service said Monday:

"Red flag warning in effect from late tonight through Wednesday afternoon for gusty winds and low relative humidity over the mountains of Los Angeles and Ventura counties and the Santa Clarita Valley. ...  Fire weather watch in effect from late Monday night through Wednesday afternoon for gusty winds and low relative humidity over the coast and valley areas of Los Angeles and Ventura counties."

The National Weather Service said surface high pressure over the Great Basin is bringing warm temperatures and dropping humidity levels down to as low as 3 percent in some areas. Warnings are in place from San Diego County north into Ventura County until 6 p.m. Wednesday.

Forecasters say high temperatures could reach into the low 80s while the strongest wind gusts could hit 50 mph, the NWS said. In the interior valleys, the NWS issued these warnings:

• Areas of northeast winds 15 to 30 mph, with gusts to 45 mph late Monday night through Wednesday. 
• Relative humidity will be 8 to 15 percent. Poor overnight recoveries. 
• Temperatures will be 80 to 90 degrees. 
• Rapid fire growth and extreme fire behavior is possible if fire ignition occurs.