Wednesday afternoon most of the smoke from the Mosquito Fire 35 miles northeast of Sacramento was moving into Northern Nevada. But that changed overnight as it spread northwest toward Chico and Redding in north-central California.
A forecast produced by NOAA expects that by 1 a.m. Friday it will again be moving into Northern Nevada, Eastern Oregon, and Southern Idaho. And from there, most likely Montana.
Below is the current air quality, produced by AirNow.