(Stevenson, WA) -- A snowboarder is dead after falling from the top of Mount St. Helens over the weekend. The Northwest Avalanche Center says the snowboarder had summited the peak and was standing near the top on Saturday when he triggered the release of a cornice, causing him to fall to his death. A cornice is an overhanging mass of hardened snow. Officials say cornices are more prone to crumbling and falling as the weather warms.