* WHAT...Heavy snow possible. Total snow accumulations between 8 and 14 inches possible above 4000 ft, with 2 to 5 inches possible down to 3500 ft.
* WHERE...Elevations above 3500 ft in Siskiyou County, including Highway 89 at Snowman Summit and Dead Horse Summit, Highway 3 at Scott Mountain Pass, Etna Summit on Sawyers Bar Road, Highway 97 at Grass Lake, and the Interstate 5 corridor around Mount Shasta City and Black Butte Summit.
* WHEN...From Tuesday evening through late Wednesday night. Heavy snow may impact the Wednesday morning commute.
* IMPACTS...Travel could become difficult, or at times impossible over higher passes. The hazardous conditions could impact the Wednesday morning and evening commutes. Roads, and especially bridges and overpasses, will likely become slick and hazardous.