* WHAT...Heavy snow expected. Widespread Moderate Impacts with total snow accumulations up to 16 inches. Winds gusting as high as 50 mph. * WHERE...Sierra Nevada above 6,000 feet. * WHEN...From 4 PM Friday to 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.

* WHAT...Heavy snow possible. Snow accumulations between 6 and 12 inches above 6,000 feet. Winds could gust as high as 50 mph. * WHERE...Sierra Nevada above 6,000 feet. * WHEN...From Friday afternoon through late Monday night. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact weekend travel. Gusty winds could bring down tree branches.

* WHAT...Snow is expected for elevations above 6000 feet. Total snow accumulations up to a foot, with up to 2 feet at the highest peaks. Minor accumulations of around an 2 inch possible down to 5000 feet. Winds could gust as high as 60 mph. * WHERE...Northern Sierra above 6000 feet, including Highway 50, Interstate 80, State Route 4, State Route 108, Southern Cascades above 6000 feet, including Lassen National Park. * WHEN...From 10 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening and Monday morning commutes. Strong winds could cause downed tree branches, localized power outages, near whiteout conditions. * ADDITIONAL DETAILS...Snow levels 6500 to 7500 feet Friday, dropping to 5500 to 6500 feet Saturday morning. Heaviest snowfall expected Friday night into Saturday morning. Light flurries to 2 inches possible down to 5000 feet with higher accumulations remaining above 6000 feet. Lull in activity Saturday afternoon through Sunday, followed by additional snow Sunday night through Monday.

* WHAT...Snow is expected for elevations above 6000 feet. Total snow accumulations up to a foot, with up to 2 feet at the highest peaks. Minor accumulations of around an 1 inch possible down to 5000 feet. Winds could gust as high as 60 mph. * WHERE...Northern Sierra above 6000 feet, including Highway 50, Interstate 80, State Route 4, State Route 108, Southern Cascades above 6000 feet, including Lassen National Park. * WHEN...From Friday morning through Monday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening and Monday morning commutes. Strong winds could cause downed tree branches, localized power outages, near whiteout conditions. * ADDITIONAL DETAILS...Snow levels 6500 to 7500 feet Friday, dropping to 5500 to 6500 feet Saturday morning. Levels increase Sunday morning to 6500 to 7500 feet before lowering again to 5500 to 6500 feet Monday. Heaviest snowfall expected Friday night into Saturday morning. Light flurries to an inch possible down to 5000 feet with higher accumulations remaining above 6000 feet. Lull in activity Saturday afternoon and evening, followed by additional snow Saturday night through Monday.