Strong winds drove a 3-acre brush fire that crossed over Highway 101 in Penngrove on Tuesday afternoon.
A second alarm was called and additional firefighting resources were arriving at 2:30 p.m., a Redcom dispatcher said.
The blaze was reported by multiple callers at 1:52 p.m. between the 200 block of Orchard Lane and the freeway.
The wind contributed to a spot fire that broke out on the west side of the freeway, the dispatcher said.
One structure was threatened but none was involved in the fire, he said.