This is a breaking news story and will be updated.

Snow began falling over Donner Summit on Monday, slicking Sierra roads and slowing traffic as an early season storm continued to move through Northern Nevada and California.

By midafternoon, no chain controls were in effect on Interstate 80, but Caltrans was screening eastbound trucks at Applegate and requiring westbound brake checks near Nyack — standard precautions during major Sierra weather.

The Nevada Department of Transportation reported chain controls on State Route 431 (Mt. Rose Highway) from Incline Lake Recreation Area to Mt. Rose Summit, with all vehicles except four-wheel drives on snow tires required to use chains.

The California Highway Patrol Truckee office reported slick roads and several vehicles sliding off I-80 nea

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