Extreme risk at top of North American public avalanche danger scale

BANFF, Alta. — The North American public avalanche danger scale is determined by the likelihood, size and distribution of avalanches.

Here’s an explanation of each level:

Extreme: Avoid all avalanche terrain. Natural and human-triggered avalanches certain. Large to very large avalanches in many areas.

High: 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.

Considerable: 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.

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Moderate: 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.

Low: Generally safe conditions. Watch for unstable snow on isolated terrain features. Natural and human-triggered avalanches unlikely. Small avalanches in isolated areas or extreme terrain.

Source: Parks Canada

The Canadian Press