A storm that turned out to be a little more potent that forecasters had expected brought out chain controls on the California side of the Sierra late Monday.
Chains were mandatory on both Interstate-80 and on U.S. 50 - the two main highways linking Northern California and Nevada.
Chains or snow tires were required over the Mount Rose summit south of Reno.
A snow advisory was posted above 7,000 feet in the Sierra starting Tuesday.
Accumulations of up to 1 inch were likely by morning. It also was expected to be windy, with gusts to 50 mph whipping the snow on the ridges.
Another 4-8 inches could fall Tuesday above 7,000 feet with up to 3 inches around Lake Tahoe, again with gusty winds.
Western Nevada was expected to see scattered snow late Monday in the Reno-Carson City-Minden corridor with rain and snow likely on Tuesday. The snow level was to be around 5,000 feet with accumulations of an inch or so in the foothills above that.
As the snow began falling, the Desert Research Institute turned on its cloud-seeding generators. Four were operating in the Tahoe Basin and three were on in the Walker River Basin.