Tnx... pretty low elevation for a lot of snow, but there is a lot of cloudiness in that area that seems to promote snow buildup... or just maybe the cloudiness correlates with more precipitation. 6400' elevation in winter in WY would be mostly dry in winter and very little snow for most spots. But go up in NW MT and northern ID, where it is cloudier than average too, you get lots of snow at low elevations.
