SONOMA COUNTY (KRON) — The National Weather Service elevated fire weather watch to a red flag warning for upper elevations of Sonoma County.
The warning goes into effect Monday at 9 a.m. through Wednesday at 5 a.m.
The warning will affect the North Bay mountains, East Bay hills and Diablo Range, respectively.
As of Monday morning, more than 3.8 million people are under the red flag warning.
Hot temperatures in additional to low humidity will increase fire danger, according to officials.
For a live look at fire conditions, click here.