California is being walloped by a powerful winter storm carrying thunderstorms, strong winds and heavy snow in the mountains.

A first round of heavy rain and mountain snow blanketed California Sunday and Monday. There's still more to come through Thursday. Here are the latest reports and forecast.

At least 11 million people in California were under flood watch Monday as a series of storms bring rain, snow, and potential flash flooding.

A flood threat remains for millions across much of the California coast as another round of moisture pushes inland off the Pacific Ocean, after Monday's storms shattered daily rain records.

"It will be a wet week across California as a series of storm systems slam into the state," an AccuWeather meteorologist said.

The coldest system of the season is bringing heavy rain to Northern California and snow to higher elevations, with Sierra foothill communities also bracing for a chill.

The Presidents Day holiday began in Southern California with bursts of rain and blasts of wind across the region, with more precipitation expected for much of the week.

As much as 10 feet of snow could fall in California from the back-to-back storms, which will return on Sunday.

Heavy snow and rain hit Northern California hard on Monday. That was round one. Round number two begins around sunrise Tuesday. Tuesday's storm will be colder and breezier. The snow level will drop below 2,

Northern California is seeing low snow, traffic delays and more as a winter storm system moves through the state.