A fast-spreading wildfire in California's wine country sparked evacuation orders as firefighters battled the blaze Saturday.

Favorable weather helped firefighters gain some ground as they battle the Pickett Fire in Napa County, but evacuation orders expanded Saturday as the blaze continued to spread.

Wildfires have cropped up in different regions across California over the past several days as a record-breaking heat wave blankets most of the state, with more fire activity expected amid a spate of dry lightning and thunderstorms.

According to Cal Fire, the blaze had reached 4,690 acres as of Saturday, and was 7% contained, with crews working overnight to keep the fire within control lines.

The blaze remains at 2,133 acres and is 0% contained, according to Division Chief Ryan Isham in a Cal Fire LNU morning briefing. A strong wind has pushed the fire eastward, sending it from the Pickett Lane area down in the floor of Napa Valley into the Aetna Springs side of Pope Valley.

The Pickett Fire near Calistoga nearly doubled in size Thursday night, reaching 2,131 acres with no containment, according to Cal Fire.

Firefighters will battle intense heat and dry weather Friday as they work to control a fast-moving blaze in the heart of California’s wine country.