These slides are generally unsurvivable. Be wary if such a warm spell occurs. These conditions usually lead to numerous large slides, not isolated events. Word generally gets around that such a cycle is underway - check with the local avalanche forecast center, ski patrol, forest ranger or warden, and local climbers and skiers. Icefalls These occur on glaciers.
Icefall events are, to a large extent, a result of glacier motion.
They may become more likely well into or just following an extended warm spell during which the glacier motion increases. Their dependence on the time of day is not particularly great. Unlike snow avalanches these events are rarely human triggered. The key to avoiding them is route selection and timing - don't be in the wrong place when they happen. Icefall areas are typically obvious so try to choose a route which avoids them.