U.S. Urban Avalanche Danger Scale
|Danger Level & Color
||Avalanche Probability & Avalanche Trigger
||Degree & Distribution of Avalanche Danger
||Recommended Action in Developed Areas
||Recommended Action in the Backcountry
||WHAT TO DO URBAN
||WHAT TO DO BACKCOUNTRY
||Natural avalanches very unlikely. Human triggered avalanches unlikely.
||Generally stable snow. Isolated areas of instability.
||Normal caution is advised.
||Travel is generally safe. Normal caution is advised.
||Natural avalanches unlikely, potentially destructive avalanches unlikely to come near or reach developed areas. Human triggered avalanches possible.
||Unstable slabs possible on steep terrain.
||Use caution in or under steeper terrain and in avalanche zones.
||Use caution in steeper terrain on certain aspects (defined in accompanying statement).
||Natural avalanches possible, potentially destructive avalanches may come near or reach developed areas. Human triggered avalanches probable.
||Unstable slabs probable on steep terrain.
||Be increasingly cautious in or under steeper terrain and in avalanche zones. Monitor avalanche forecasts.
||Be increasingly cautious in steeper terrain.
||Potentially destructive natural avalanches likely to come near or reach developed areas, natural and human triggered avalanches likely.
||Unstable slabs likely on a variety of aspects and slope angles.
||Being in avalanche terrain or avalanche zones is not recommended. Minimize exposure time in avalanche zones. Monitor avalanche forecasts.
||Travel in avalanche terrain is not recommended. Safest travel on windward ridges of lower angle slopes without steep terrain above.
||Potentially destructive natural avalanches likely to reach developed areas. Widespread natural or human triggered avalanches certain.
||Extremely unstable slabs certain on most aspects and slope angles. Large, destructive avalanches possible.
||Being near or in avalanche terrain or avalanche zones is not recommended. Eliminate exposure to avalanche zones.
||Travel in avalanche terrain should be avoided and travel confined to low angle terrain well away from avalanche path run-outs.