An avalanche, sometimes called a snowslide, is the rapid flow of snow, ice and/or rock down a slope or mountain. They can be triggered by natural forces such as precipitation, earthquakes or the weakening of snowpack (layers of slow that accumulate in areas of high elevation and cold temperatures).
An avalanche is a large amount of snow moving quickly down a mountain, typically on slopes of 30 to 45 degrees. When an avalanche stops, the snow becomes solid like concrete and people are unable to dig out. Avalanches strike suddenly and can be deadly. People caught in avalanches can die from suffocation, trauma or hypothermia. Avalanches can be caused by people, new snow and wind, move at speeds of 60 to 80 MPH and peak December through March.