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.
It is now the wettest season on record in Northern California, where most of the state gets its water supply.
UPDATE 10:48 p.m. Feb. 11: The evacuation and shelter-in-place notice has been lifted for Wilton residents.
(AP) - California's winter keeps getting wetter as the first in the latest round of storms moves ashore, bringing heavy rain and powerful winds.
(AP) - The National Weather Service in Reno says winds in excess of 100 mph over Sierra ridgetops could churn up waves as high as 5 feet on Lake Tahoe this weekend as a series of winter storms dumps several more feet of snow in the mountains.
Residents in Truckee and Washoe County are weathering the latest storm Tuesday while still reeling from the effects of the previous storm that hit over the weekend.