Hazard rating definition table
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Definition
Avalanche hazard; avalanche danger is the potential for an avalanche(s) to cause damage to something of value. It is a function of the likelihood of triggering and the destructive size of the avalanche(s). It implies the potential to affect people, facilities or things of value, but does not incorporate vulnerability or exposure to avalanches. Avalanche hazard is commonly expressed using relative terms such as high, moderate and low.
North American Public Avalanche Danger Scale
Avalanche danger is determined by the likelihood, size and distribution of avalanches.
| Danger Level | Likelihood of Avalanches | Avalanche Size and Distribution |
| 5 | Natural and artificially triggered avalanches almost certain. | > Size 3 avalanches are widespread. |
| 4 | Natural avalanches likely; artificially triggered avalanches very likely. | Size 2-3 avalanches are widespread; or > size 3 avalanches in specific areas. |
| 3 | Natural avalanche possible; human-triggered avalanches likely | Small avalanches in many areas; or large avalanche in specific areas; or very large avalanches in isolated areas. |
| 2 | Natural avalanche unlikely; human-triggered avalanches possible | Small avalanches in specific areas; or large avalanches in isolated areas |
| 1 | Natural and human-triggered avalanche unlikely. | Small avalanches in isolated areas or extreme terrain. |
