You can easily trigger avalanches on many steep slopes. Avalanches can get large enough to bury a car or destroy a small house (size 3).
You can easily trigger avalanches on a few steep slopes. Avalanches can get large enough to bury a large truck or destroy several houses (size 4). Remote triggering is possible.
You can very easily trigger avalanches on many steep slopes. Avalanches can get large enough to bury or even kill you (size 2).