Avalanche defined as a rapid snow mass flow down slopes. Forms when weak layers collapse under slab weight. Four types: slab, loose snow, wet snow, and glide avalanches. Triggers include heavy snow, ...

TRUCKEE, Calif. – Investigations are ongoing into the deadly Feb. 17 avalanche near Perry Peak. The Sierra Avalanche Center (SAC) continues to release new details as their investigation unfolds.

Most of the western U.S., including the Lake Tahoe region of California and Nevada, has had an exceptionally warm winter—breaking records in many areas. And that unseasonable warmth may have caused a ...