Rescue operations are in progress for six backcountry skiers who became trapped by an avalanche near Donner Pass in the Sierra Nevada, California. These skiers were part of a group of 15 participating in a guided expedition led by Blackbird Mountain Guides. Currently, nine individuals are still missing, and rescue teams are navigating through blizzard conditions in their efforts to reach them. The avalanche took place in the Castle Peak area, a well-known destination for backcountry skiing. The Nevada County Sheriff's Office has confirmed that two of the rescued skiers are receiving medical treatment. The ongoing storm has brought treacherous weather, including high winds and heavy snowfall, which are complicating rescue efforts and increasing the risk of further avalanches.