(KRON) — The Sites Fire burning in Colusa County has grown to 19,195 acres and is 15% contained, Cal Fire officials said in an update overnight Thursday.

The wildfire ignited at 1:39 p.m. Monday in the area of Sites Lodoga Road and Stone Corral Avenue. Winds blowing between 10-20 mph and low relative humidity fueled the fire, Cal Fire officials said. A Red Flag Warning is in effect.

A dark plume and thick blanket of wildfire smoke could be seen on ALERT Wildfire’s live camera at 11 a.m. Tuesday.

Thick wildfire smoke is seen above the Sites Fire on June 18, 2024. (Image courtesy ALERT Wildfire / Cal Fire)

Air quality officials said drift smoke from the Sites Fire and Sonoma County’s Point Fire was reported around the northern region of the San Francisco Bay Area. “Smoke mainly from the Sites Fire is expected to continue to impact portions of Sonoma, Napa and Solano counties through (Wednesday),” the Bay Area Air Quality Management District wrote.

Fire officials have not yet determined what sparked the Sites Fire.

Evacuation orders are in effect for the following locations:

• Leesville Lodoga Road South to Leesville Road

• Leesville to Huffmaster Road

• Huffmaster Road to Maxwell Sites Road

• Leesville Road to Antelope Valley Ranch and North from Antelope Valley Ranch

• Sites Lodoga Road at Sites