Avalanches occur in the snow. They can reach speeds of 80 mph in just 5 seconds. Avalanches are most common during and in the 24 hours right after a storm that dumps 12 inches (30 centimeters) or more of fresh snow.
These factors affect whether and how a slope avalanches:
- Storminess
- temperature
- wind
- slope steepness
- orientation (the direction it faces)
- terrain
- vegetation
- general snowpack conditions
It is unusual for a victim of an avalanche to escape.
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