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What is an avalanche? | Weather You Know An avalanche begins with the weather. Often after heavy snow, the flakes will pile up, forming a loosely bonded area of snow that is formed on top of other layers. Author: Rob Carlmark Updated: 11:21 AM PDT April 7, 2021 An avalanche is a large area of snow moving all at once. It can move very quickly with enough force to take out stands of trees and level buildings. They can also bury skiers, snowboarders and snowmobilers that may have accidently triggered the slide.  An avalanche begins with the weather. Often after heavy snow, the flakes will pile up in inches and feet, forming a loosely bonded area of snow that is formed on top of other layers. The previous layers are very important and can sometimes contain areas of very loose snow or slick plate-like formations of snow. This area is called a “weak layer” and forms a zone with less friction that is barely holding the deeper and heavier layers on

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