Forecasters said Wednesday there could be water level rises on small rivers and creeks and debris flows in burn scars areas left by last year's intense wildfires, including portions of Butte County. That's where the Camp Fire in November killed 86 people and destroyed nearly 15,000 homes.
People up and down California are facing extreme weather. Forecasters say heavy rain and snow will continue to threaten burn areas for at least 24 hours and thousands of people have already been ordered to evacuate.
The western foothills of the Sierra Nevada and northern Coast Range could see four to eight inches of rainfall over the next two days. The higher elevations of the Sierra could get six feet of snow and blizzards driven by 110-mile-an-hour winds. The National Weather Service says an even stronger storm will blow in Wednesday night.
A flood watch is effect for many parts of Northern California.
Sandbags are available in some areas to help property owners reduce the risk of flooding. The El Dorado County Sheriff's Department is among the agencies offering free sandbags.
Caltrans is providing updates on road conditions. Besides heavy snow amounts, wind will be a major issue for Sierra travelers with gusts of 90-to-130 miles-per-hour.