An avalanche is a rapid flow of snow down a hill or mountain. Although avalanches can occur on any steep slope given the right conditions, certain times of the year and types of locations are naturally more dangerous. Statistically, avalanches tend to run on slopes of 35 to 50 degree angles.
While avalanches are sudden, there are typically a number of warning signs you can look for or feel before one occurs. Avalanches kill more than 150 people worldwide each year. In 90 percent of avalanche incidents, the snow slides are triggered by the victim or someone in the victim’s party.