* CHANGES...Increased wind gusts. * WHAT...Heavy wet snow. Snow accumulations near 12 inches above 7000 feet, with up to 6 inches below 7000 feet. Snow accumulations up to 20 inches along the crest west of Lake Tahoe. Wind gusts of 70 to 90 mph over ridges and gusts of 45 to 55 mph for Truckee and Lake Tahoe communities. Wave heights 2 to 5 feet on Lake Tahoe. * WHERE...Greater Lake Tahoe Area. * WHEN...From 10 AM Friday to 10 AM PST Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Friday evening commute. Strong winds and Sierra cement snow could cause damage to trees and power lines. Strong winds and rough waves on Lake Tahoe will create hazardous conditions for small watercraft. * ADDITIONAL DETAILS...A burst of heavy snow is likely with this system late Friday afternoon into Friday evening with snow levels falling to as low as 5500 feet.

* WHAT...Snow is expected for elevations above 6000 feet. Total snow accumulations 6 to 12 inches, with up to 18 inches 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 will impact the Friday evening commute. Strong winds could cause downed tree branches, localized power outages, and reduced visibilities. * ADDITIONAL DETAILS...Snow levels 6500 to 7500 feet Friday, dropping to 5500 to 6000 feet Saturday morning. Heaviest snowfall expected late Friday morning into the overnight hours. 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.