Colorado’s Loveland Pass Avalanche 20 April 2013

Six skiers and snowboarders were buried alive in an avalanche many called predictable.
One survived.
As details of the accident trickled out—their high level of experience and position in the ski industry—it became impossible not to ask: How did they end up in Colorado’s deadliest slide in 50 years?

http://www.outsideonline.com/outdoor-adventure/snow-sports/Loveland-Pass-Avalanche-The-Worst-Accident-That-Shook-the-Ski-Industry.html?page=1

http://m.denverpost.com/denverpost/pm_102407/contentdetail.htm?contentguid=YYqBNvn5

This is worth a read, a Denver Post article.

A detailed visual analysis of the incident.

http://www.wildsnow.com/9980/sheep-creek-avalanche-site-visit/

Many lessons to be learnt.

See also the long discussions on the same website about the incident including a link to the official report from the Colorado Avalanche Centre.