Ten skiers are missing following an avalanche at the Castle Peak ski area in California's Tahoe National Forest, near the Nevada border. Six individuals survived the incident and are awaiting rescue at the scene. The group comprised four ski guides and twelve guests. Over 50 rescue personnel were deployed, facing extreme weather conditions including heavy snowfall and high winds, with up to two and a half meters of snow expected in the next 48 hours above 1,000 meters. Rescue efforts are proceeding cautiously due to the ongoing high avalanche risk, exacerbated by a storm that has impacted Southern California with heavy rain and Northern California's mountains with significant snow since Sunday.