Ongoing gusty winds prompted weather officials to extend a fire danger warning until Thursday morning.
The red-flag warning started at 10 p.m. Monday and was due to expire Tuesday morning.
Instead weather officials expanded red-flag warnings to huge sections of the state in response to dry winds and expected record-breaking high temperatures.
The warnings now stretch from northern Mendocino County down through much of the Bay Area. A huge area of Southern California also was included in a huge red-flag warning jurisdiction.
The winds, combined with low humidity and the very dry hillsides, have created potential fire conditions leading to the unusual warning for January. Areas of high concern are in the North Bay and East Bay hills.
Sonoma County fire dispatchers and Cal Fire captains in St. Helena and Willits reported no grass fires Tuesday, except for a small fire in Napa that was quickly doused.
Tuesday night, north to northeast winds are expected to be 10-20 mph with gusts to 30 mph. Along ridges, gusts could get to more than 40 mph.