Fueled by hot and dry conditions, the Pickett Fire in Napa County grew over the weekend, becoming the largest in the region this year as it spurred evacuations while threatening homes and vineyards.

The Pickett Fire in California's Napa County had burned 4,690 acres as of Saturday morning, making it the largest fire in the Bay Area since last year.

The wildfire spread to more than 2,100 acres hours after erupting near Calistoga, authorities said. Evacuation orders were issued in parts of Napa County.