Update: Grass fire reaches 500 acres, evacuations lifted near American Canyon

Firefighters battled a grass fire that quickly ballooned to 500 acres Sunday afternoon just west of Interstate 80 along the county line between Napa and Solano counties.

The American Fire, along American Canyon Road about 1½ miles east of American Canyon, was 30 percent contained at 7 p.m. after being pushed by gusty winds, according to Cal Fire.

Evacuation advisories issued around 5 p.m. for homes near Newell Drive was lifted at 7 p.m., according to the Napa County Sheriff’s Department, which urged motorists to avoid the area.

Cal Fire spokesman Capt. Cody Parks said a “full response of fire crews” was responding to the blaze, which started around 1 p.m. By 4 p.m., the fire had swiftly grown to 150 acres as crews from Cal Fire, Solano County and Napa County on the ground and aircraft made efforts to fight the blaze in dense hillside brush.

The cause of the fire was unknown, but the area was under a red flag warning for most of Sunday. It was canceled by the National Weather Service around noon for most of Northern California, including Napa and Solano counties.

The advisory and forecasts of fire-prone conditions prompted PG&E to cut power to 10,000 customers in Butte County and elsewhere Saturday night. Power was fully restored by the utility Sunday afternoon. The Napa area was also at elevated risk for a shutoff Saturday evening, but the utility ultimately kept electricity on in the area.

The area, and much of the northern half of the state, will be under a fire weather watch Wednesday and Thursday for more dry and blistery conditions, according to the weather service.