Today's storm is the latest of a series to dump rain on the region, which has been hard hit by six years of drought.

Officials warned of potential mud flows in areas affected by wildfires last year and heavy rains in the afternoon, when there will be a slight chance for thunderstorms. Forecasters say southern and eastern Los Angeles County will be hardest hit.

Storms have added 33.6 billion gallons of water to Lake Tahoe since Jan. 1

The series of storms over the last few weeks in the Sierra Nevada have been very good to Lake Tahoe.

According to the National Weather Service, the lake has gained about 33.6 billion gallons of water since Jan. 1 -- and the lake has risen about one foot.

It's a big turn around from just a few years ago, when the drought had Lake Tahoe water levels reaching record lows.

After a lull Monday, more snow is on the way for the Sierra through Thursday.

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