The second storm, forecasters say, could bring thunder and dump up to 2 inches of rain in central and southern valleys, 2 to 4 inches in the foothills and up to 6 inches in some mountain spots.
State water officials plan Thursday to survey the anemic mountain snow pack, and will likely find that California's precipitation is badly lagging what's needed to quench the region's thirst. 2013 was California's driest year on record.
In Nevada, the first of back-to-back storms dropped several inches of snow at Lake Tahoe and up to a foot and one-half on the mountain ridges.
A winter weather advisory was put into effect from 4 p.m. Wednesday to 10 a.m. Thursday for the Reno-Tahoe area, south to Mammoth Lakes.
The second wave of wetter weather begins Friday night into Saturday.
Dry and warm conditions continue through Saturday with temperatures in the 70s, followed by light rain on Sunday and Monday.
Forecasters are predicting a chance of showers and possible thunderstorms in Sacramento Thursday afternoon and early evening.
A new, warmer storm is expected to arrive in much of Northern California Wednesday.
The Lake Tahoe area has just recorded its wettest February in 14 years, according to the National Weather Service in Reno. But winter precipitation is still just above half of normal.
Northern Californians are waking up to more rain and snow this morning. It’s the second of two storms to hit the region this week.