The following is some basic information on avalanches. Most avalanches occur on slopes of 30 to 45 degrees, but large ones can occur on slopes as little as 25 degrees. Snow is most unstable after and during snowfalls or prolonged heating by the sun, especially on steep inclines. Sunballs and cartwheels on the surface during a warming period could indicate instability in deeper layers. The most dangerous avalanches usually occur on convex slopes.
Avalanches can take place on short slopes as well as long ones.
Leeward slopes are dangerous because wind-blown snow adds depth, creating hard, hollow sounding wind slabs. South-facing slopes are most dangerous in the spring. Smooth grassy slopes are the most dangerous spots, but avalanches can start among trees under conditions of stress. Avalanche danger can vary within a slope. Following an old track does not necessarily mean a slope is safe.