A devastating avalanche near Lake Tahoe in California has claimed the lives of eight skiers, with one still missing, marking the deadliest avalanche in the U.S. in over four decades. The tragedy unfolded as a result of a guided, three-day trek in the Sierra Nevada, where a monster winter storm was pounding the West Coast. The victims, including three guides, were found close together, with seven women and two men aged 30 to 55. The extreme conditions have prevented the removal of the victims from the mountain, and the search and rescue efforts have shifted to recovery. The avalanche was triggered by a witness who saw it and shouted a warning, but it quickly overtook the group. This incident is the deadliest since 1981 when 11 climbers lost their lives on Mount Rainier, Washington. The Castle Peak area, where the avalanche occurred, is known for its treacherous conditions and high risk of avalanches. The Sierra Avalanche Center has issued a warning, advising against travel due to the unstable snowpack and predicted snowfall. The expedition was led by Blackbird Mountain Guides, who notified authorities about the avalanche through the skiers' emergency beacons. The group was returning to the trailhead when the tragedy struck, and the company is assisting in the search and rescue efforts. The incident has highlighted the dangers of backcountry skiing and the importance of proper planning and safety measures.