North American Public Avalanche Danger Scale Avalanche danger is determined by the likelihood, size and distribution of avalanches.
|Likelihood of Avalanches
||Avalanche Size and Distribution|
||Avoid all avalanche terrain.
||Natural and human- triggered avalanches certain.
||Large to very large avalanches in many areas. |
||Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
||Natural avalanches likely; human- triggered avalanches very likely.
||Large avalanches in many areas; or very large avalanches in specific areas. |
||Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding and conservative decision-making essential.
||Natural avalanches possible; human- triggered avalanches likely.
||Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.|
||Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
||Natural avalanches unlikely; human- triggered avalanches possible.
||Small avalanches in specific areas; or large avalanches in isolated areas. |
||Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
||Natural and human- triggered avalanches unlikely.
||Small avalanches in isolated areas or extreme terrain.|
|Safe backcountry travel requires training and experience. You control your own risk by choosing where, when and how you travel.|