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International Avalanche Danger Scale
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LOW: Generally stable snow. Isolated areas of instability.
Natural avalanches very unlikely.
Human triggered avalanches unlikely.
Travel is generally safe.
Normal caution advised.
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MODERATE: Unstable slabs possible on steep terrain.
Natural avalanches unlikely.
Human triggered avalanches possible.
Use caution in steeper terrain on certain aspects (defined in accompanying statement).
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CONSIDERABLE: Unstable slabs probable on steep terrain.
Natural avalanches possible.
Human triggered avalanches probable.
Be increasingly cautious in steeper terrain.
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HIGH: Natural and human triggered avalanches likely.
Unstable slabs likely on a variety of aspects and slope angles.
Travel in avalanche terrain is not recommended.
Safest travel on windward ridges of lower angle slopes without steeper terrain above.
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EXTREME: Extremely unstable slabs certain on most aspects and slope angles.
Large, destructive avalanches possible.
Widespread natural or human triggered avalanches certain.
Travel in avalanche terrain should be avoided and travel confined to low angle terrain well away
from avalanche path run-outs.
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