Truckee, California – A pattern change beginning Sunday will bring multiple days of mountain snow and travel impacts across Northern California.
According to the National Weather Service in Sacramento, showers and Sierra snow will develop late Sunday and continue through midweek. The greatest impacts are expected from Tuesday into early Wednesday, when snowfall rates increase and travel conditions deteriorate at higher elevations.
Forecast guidance shows widespread snow accumulations of 6 to 12 inches across Sierra passes, with localized totals of 12 to 18 inches possible along the crest. Snowfall will primarily affect elevations above 6,000 to 7,000 feet Monday, with snow levels lowering to around 5,000 to 6,000 feet Tuesday and Wednesday.
These conditions are likely to impact major mountain corridors, including Interstate 80 near Donner Summit, U.S. Highway 50 over Echo Summit, and State Route 88 through Carson Pass. Chain controls are likely during periods of heavier snow, and travel delays should be expected, particularly overnight and during the morning commute.
The Weather Service classifies the overall impact as moderate, citing slick roads, reduced visibility, and longer-than-normal travel times. Motorists are encouraged to monitor Caltrans QuickMap for the latest road conditions and chain requirements.
While valley locations will mainly see rain, cooler temperatures could contribute to slick conditions during heavier showers. No widespread flooding is expected at this time, but wet roads may slow travel in urban areas.
Officials advise travelers to plan ahead, carry chains when heading into the mountains, and allow extra time to reach destinations. Those commuting for work or school, especially early morning travelers and young workers heading into mountain communities, should be prepared for rapidly changing conditions.
Snow showers are expected to gradually taper late Wednesday into early Thursday, though lingering travel impacts may persist in higher terrain.
