A fine example of Sastruga from 2009's snow storms.
It's like a wave of snow in my very own front yard!
sastruga \SAS-truh-guh\ noun
: a wavelike ridge of hard snow formed by the wind -- usually used in plural
"Over the sastrugi it is all up and down hill, and the covering of ice crystals prevents the sledge from gliding even on the down-grade." (Robert Falcon Scott, Journals: Captain Scott's Last Expedition)