* WHAT...Heavy snow with total snow accumulations 3 to 5 feet above 6,000 feet with 5 to 7 feet over the highest elevations and 1 to 2 feet at 4,000 feet. Several inches up to a foot down to 3,000 feet. Winds could gust as high as 60 mph. * WHERE...Sierra Nevada and adjacent foothills. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the Tuesday morning and evening commutes. Strong winds could cause tree damage. * ADDITIONAL DETAILS...Snow levels at 3,000 to 4,000 feet this morning. Light snow accumulations down to 2,000 feet Tuesday night into Wednesday.

* WHAT...Heavy snow expected. Accumulation amounts range from up to 1 foot around 2000 to 2500 feet, 1 to 2 feet at 2500 to 3500 feet and 4 to 8 feet at higher elevations. Wind gusts of 45 to 55mph expected. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park including Interstate 80 and Highway 50, northern Shasta County including portions of Interstate 5, the Coastal Range, and foothill regions of the Sierra Nevada. * WHEN...Until 10 PM PST Thursday. * IMPACTS...Dangerous to near impossible travel conditions with chain controls and road closures. Low visibility due to a combination of wind and heavy snow. * ADDITIONAL DETAILS...Snow levels will be around 2500 to 3500 feet by Monday night and 1500 to 2500 feet Tuesday through Thursday. Potential to see snow levels as low as 1000 feet at times along the Sierra and below 1000 feet in the northern Sacramento Valley.