Evacuation orders were issued Saturday morning for the entire towns of Healdsburg and Windsor with a total of 50,000 residents in northern California, as the growing Kincade Fire is expected to move toward there.

The wildfire ignited Wednesday night and exploded very fast, scorching over 25,455 acres (103 square kilometers) by Saturday morning with only 10 percent containment, according to California Department of Forestry and Fire Protection (Cal Fire).

The blaze destroyed 49 structures and is now threatening thousands of homes, Cal Fire said. There are no reports of fatalities.

Cal Fire said residents in the evacuation zone need to be out of their homes by 4 p.m. Saturday local time since the fire could reach the towns Saturday night.

California Governor Gavin Newsom Friday declared a state of emergency for Sonoma county, where the Kincade Fire is burning.

About 2,000 residents of Geyserville and the surrounding area threatened by the fire were evacuated on Thursday, and more than 2,000 firefighters were assigned to battle the blaze with the help of 10 helicopters and numerous air tankers.