Elyse Saugstad was skiing in the Cascade Mountains when a big wall of snow came down the mountain. She heard someone say 'AVALANCHE!' and was able to get out of the way just in time. Avalanches are when snow, ice, or rocks fall down a mountain really fast. They can be very dangerous and even kill people. In the United States, avalanches kill about 27 people every year.
Avalanches need three things to happen: the right slope, a layer of strong snow on top of weak snow, and something to make the weak snow fall. The slope needs to be steep enough for the snow to move, but not so steep that it can't build up. The strong snow on top of the weak snow is like a big weight that can make the weak snow fall. Something like a skier or a lot of snow can make the weak snow fall and start an avalanche.
Elyse was lucky because she had a special bag that she could wear while skiing. If she got caught in an avalanche, the bag would inflate and help her stay near the surface of the snow. This would make it easier for people to find her and rescue her. Avalanches can be very fast and can travel over 160 kilometers per hour. They can also be very destructive and can even kill people. It's very important to be careful when skiing or snowboarding in areas where avalanches can happen.
