The Madre Fire ignited Wednesday afternoon in San Luis Obispo County and has since grown to more than 35,500 acres, according to Cal Fire.

A wildfire in California’s San Luis Obispo County rapidly expanded overnight and was covering more than 35,000 acres on Thursday morning, prompting evacuation orders, closing part of a highway and sending thick smoke billowing into neighboring counties. It is the biggest wildfire the state has seen this year.

The fire has prompted evacuation orders, warnings, and highway closures in San Luis Obispo County around 100 miles north of Los Angeles.