Wildfires now up to 100 miles wide as death toll reaches 40

Firefighters gained some ground on a blaze burning in the heart of California's wine country but face another tough day ahead with low humidity ... . FILE - In this Tuesday, Oct. 10, 2017 file photo, people walk past a fallen transformer and downed power lines on Parker Hill Road in Santa Rosa, Calif.

The Latest: Phone companies told save evidence tied to fires

A helicopter flies through the smokey sky to drop a load of water on a wildfire Thursday, Oct. 12, 2017, in Sonoma, Calif. Officials say progress is being made in some of the largest wildfires burning in Northern California but that the death toll is almost sure to surge.