A snowboarder triggered – and then outpaced – a slab avalanche on Mount Washington in Sargent’s Purchase, New Hampshire, on November 29. Andrew Drummond captured this video showing the ...

Rettie says the key to understanding storm-slab avalanches is knowing about layers. He says as new snow falls, it's more likely to bond with itself than the layer it's falling on. The result is a ...

The skier was part of a three-person group that reportedly unintentionally triggered the avalanche. UAC said the skier, who has not been identified, was caught, carried, and partially buried with his ...