Sun Cups - Stoney Indian Pass

Sun Cups, Ablation Hollows, whatever you call them, I just think they are cool! I was fascinated with these surface snow forms during my hiking through Glacier National Park. They are formed during dry conditions during snow melt in alpine areas that receive direct sun during the melting season (insolation). High points on the snow evaporate water molecules more slowly than the depression areas, where water collects as it melts, deepening the depression. Dirt and debris can help speed up the process. This patch of snow drift on Stoney Indian Pass was still quite solid and icy underneath. I became obsessed with finding the most unique shapes during my travels.