* WHAT...Heavy snow possible. Total snow accumulations of 4 to 8 inches between 4000 feet to 5000 feet, with up to 12 inches at 5000 feet. Winds could gust as high as 40 mph.
* WHERE...Northern Sierra above 4000 feet, including Highway 50, Interstate 80, State Route 4, State Route 108, Southern Cascades above 4000 feet.
* WHEN...From Tuesday evening through early Friday morning.
* IMPACTS...Travel could be very difficult to impossible. Travel could be very difficult to impossible Tuesday night through early Friday morning. Gusty winds could bring down tree branches and significant reductions in visibilities.
* ADDITIONAL DETAILS...Snow levels 3500-4500 feet Tuesday night, rising to around 4500-6000 feet Wednesday. Heaviest snow is expected Wednesday afternoon into the overnight hours, with snowfall rates 1-2+ inches per hour.