* WHAT...Heavy snow expected above 5000 feet. Total snow accumulations of 6 to 12 inches above 5000 feet, with 2 to 4 feet above 6000 feet. Locally higher amounts at highest peaks. Winds gusting as high as 55 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park above 5000 feet. * WHEN...From 10 PM Friday to 4 PM PST Monday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Friday evening through Monday morning commutes. Strong winds could cause tree damage. * ADDITIONAL DETAILS...Snow levels 6500-7500 feet Friday night into Saturday morning, lowering to 5000 to 6000 feet Saturday afternoon into Sunday, and further to around 4500 to 5500 feet by early Monday morning. Heaviest snow expected on Sunday.

* WHAT...Heavy snow. Snow accumulations of 1 to 3 feet above 7000 feet with 4 to 10 inches at lake level. Ridgetop winds gusting to over 100 mph at times. Wind gusts of 40 mph and wave heights of 1 to 3 feet on Lake Tahoe. * WHERE...Greater Lake Tahoe Area. * WHEN...From 12 AM PST Saturday to 10 AM PST Monday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions will impact weekend travel in and across the Sierra. Strong winds could cause damage to trees and power lines.

* WHAT...Heavy snow possible. Accumulations are uncertain at this time but may range from 2 to 4 feet above 5000 feet. Locally higher amounts are possible at higher elevations. Winds could gust as high as 45 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...From Friday afternoon through Sunday morning. * IMPACTS...Dangerous travel conditions with chain controls and road closures possible. Low visibility due to combination of wind and heavy snow. * ADDITIONAL DETAILS...Snow accumulations remain above pass level through Friday afternoon, then drop to 5000 to 6000 feet late Friday night into Saturday. Potential for mountain snow to continue into early next week.