Fast-moving wildfires burning across Northern California’s wine country had claimed at least 15 lives by Tuesday afternoon and destroyed an estimated 1,500 homes and commercial buildings, according to the California Department of Forestry and Fire Protection.

Flames have spread across more than 115,000 acres (46,500 hectares) since the fires broke out on Sunday but firefighters took advantage of cooler temperatures, decreased winds and coastal fog on Tuesday to try to make headway against the fires.