A local weatherman in the Philadelphia market announced the other night that he was going to incorporate two newly coined words (as per him, I guess) into his winter forecasts: snirt and slickery.

snirt: dirty snow, especially at the side of the road [carbon tinged, etc; not the yellow kind].

slickery: a surface that's wet and icy.

I seem to have heard snirt before, mebbe even discussed here a while back. Slickery seems new to me though...and I like it.