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