"snowdrift / snow drift" should also be accepted, I think.
Thank you. It's added.
Snowdrifts are quite different from avalanches merely in terms of scale and consequence. What other icey phenomenona might this include?
What is the etymology of χιονοστιβάδα?
The first part is from χιόνι, meaning "snow" (from the Ancient Greek χιών); the second part is στιβάδα, meaning "layer".