Heads for all those travelling on Highway 3 from the Paulson Summit to the Kootenay Pass.
Snowfall with total amounts of 20 to 30 cm is expected.
Environment Canada warns that heavy snow is forecast to redevelop this evening, with 10 to 15 cm of snow expected tonight and a further 10 to 15 cm on Wednesday.
Snow is expected to ease Wednesday evening.
Visibility may be suddenly reduced at times in heavy snow. Rapidly accumulating snow will make travel difficult.
Weather in the mountains can change suddenly resulting in hazardous driving conditions.
A snowfall warning is also in effect for the West Kootenay:
Total amounts of about 15 cm is expected.
A frontal system moving across B.C. will bring heavy snow to the area tonight and Wednesday. The heaviest snow is expected tonight and Wednesday morning but will continue for most of Wednesday afternoon.
About 5 cm of snow is forecast tonight and an additional 5 to 15 cm Wednesday with the highest amounts near Nelson and Trail.