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A new weather system carrying rain and snow headed into Northern California on Tuesday.

Day-long flash flood watches were issued by the National Weather Service for portions of the North Complex burn scar in Butte and Plumas counties, where the storm had potential to bring periods of heavy rainfall.

Forecasters also warned of heavy snow and strong winds developing in the northern Sierra Nevada and southern Cascade Range, starting out at higher elevations Tuesday and lowering slightly on Wednesday.

Significant travel disruptions were likely across highway passes of the northern Sierra, forecasters said.

Winter weather advisories were to go into effect by late afternoon in the central Sierra above 7,000 feet.

Forecasters said there was minimal concern about debris flows for burn areas around the San Francisco Bay Area due to predicted rainfall rates in that region, but people living near burn areas were urged to be mindful of ash and other material washing off hillsides.