Last Thursday some bad weather was rolling in as I drove to work. To get to Denver from Colorado Springs, you have to go over Monument Pass. The summit of Monument Pass is over 7300 ft (2225m) in elevation; the weather up there is often weird. It also sort of corrals weather to one side or the other.
Fog was rolling in as I crossed over the summit and the snow was blowing from the north, which gave that side of the trees a bit of frosting.