* WHAT...Heavy snow expected. Widespread Moderate Impacts with total snow accumulations up to 20 inches. Winds gusting as high as 50 mph.
* WHERE...Sierra Nevada above 6,000 feet.
* WHEN...Until 4 AM PST Tuesday.
* IMPACTS...Travel could be very difficult to impossible. The hazardous conditions will impact the Friday evening and Monday morning commutes. Gusty winds could bring down tree branches. Roads, and especially bridges and overpasses, will likely become slick and hazardous.