A red flag warning has been issued for Northern California beginning Wednesday afternoon.

According to the National Weather Service, the warning lasts through Thursday evening. A Red Flag Warning means that critical fire weather conditions are, "either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior."

The effect is scheduled for 1 p.m. Wednesday, June 21 - 11 p.m. Thursday, June 22.

There is also currently a Heat Advisory and an Excessive Heat Warning, both in effect through 11 p.m. Friday, June 23.