NORTHERN CALIFORNIA — The summer fire season has arrived in Northern California, with two major incidents burning on either side of Lake County on Monday.

On Sunday just after 12:30 p.m., the Point fire began in Sonoma County.

Cal Fire said it’s located on Stewarts Point Road and Skaggs Springs near Geyserville.

By Monday night the fire had reached approximately 1,207 acres and 20% containment. Cal Fire said two structures have been destroyed and one firefighter injured.

Resources assigned include 400 personnel, 50 engines, 12 crews, 10 dozers, 10 water tenders and four helicopters, Cal Fire said.

Officials said crews overnight continued building and strengthening control lines, working under favorable conditions. The cause is under investigation.

Then, on Monday afternoon, a new fire began in neighboring Colusa County.

The Sites fire began at approximately 1:39 p.m. on Sites Lodoga Road and Wilson Creek, southeast of Stonyford, Cal Fire reported.

By 8 p.m., the fire was reported to have grown to 4,463 acres, with zero containment.

The fire put up a large plume of smoke that could be seen around Lake County.

Cal Fire said the fire is being influenced by north winds with speeds of up to 20 miles per hour, coupled with low relative humidity.

Those conditions had led to the National Weather Service issuing a red flag warning that remained in effect in Colusa County through 8 a.m. Tuesday.

Smoke from the fire moved into southeastern Lake County, causing the air quality index to rise there, according to the PurpleAir website.

Cal Fire said the Sites fire’s cause remains under investigation.

Email Elizabeth Larson at This email address is being protected from spambots. You need JavaScript enabled to view it.. Follow her on Twitter, @ERLarson, or Lake County News, @LakeCoNews.