The obligation to book in advance also applies to any overnight stay in a winter quarter or SAC shelter. The website of each hut will provide you with information on how to book your berth.
Situation warnings on the SAC portal include impassable paths, damaged or missing bolts or unusually bad conditions which make a route impassable for a prolonged period (collapsing seracs, rockfalls, etc.).
Please inform us if the danger has passed or if the danger warning is no longer relevant.