I camped at Emmons Flats and saw the Mountaineers group leave camp at 12:30 am in high winds. My guess is that they were very very tired. After a big gust snapped a few tent poles at our camp, we decided to go back to sleep. When we left Camp Schurman at 10:30 am they were still on their way to the summit. It looked like they were having route finding issues higher up where recent snows had covered the boot track.