I believe this incident has been alluded to briefly in other threads. It doesn't look good for the four who are missing; they are evidently well equipped and experienced

Mount Rainier National Park (WA)
Search For Four Missing People Scaled Back

On Monday, the seventh day of the search for four people in two missing parties on Mountain Rainier, the mountain came out of the clouds for the first time, providing perfect weather for extensive air and ground operations. In spite of a major search effort, the parties were not located. With the return of winter weather and the odds of a favorable outcome declining daily, operations are being scaled back and will transition back to the park today. Investigators will continue to work on an in-depth investigation, and operations are shifting to an extended limited continuous search. Family liaisons worked with four separate families throughout the week. The consulate provided translators to assist in overcoming language barriers with family from Korea. Ninety-one people were assigned to the search over the course of the incident, which was managed by the Western Incident Management Team (Denny Ziemann IC). The team took over management of the search on January 21st, providing assistance to a park staff depleted by the impacts of the tragic shooting of Ranger Margaret Anderson.