The advisory remains in effect until 10 a.m. Wednesday. Snowfall rates of up to 1 inch per hour are possible.
“Hazardous travel conditions are expected across many mountain roads and highway passes,” a NWS post states.
Motorists are advised to carry chains if traveling in mountainous areas, including on state routes 299, 3 and 36.
Showery conditions with the possibility of thunderstorms are expected in other areas.