North American Public Avalanche Danger Scale
Avalanche danger is determined by the likelihood, size and distribution of
avalanches.
DANGER LEVEL
TRAVEL ADVICE
LIKELIHOOD
OF
AVALANCHES
AVALANCHE
SIZE AND
DISTRIBUTION
5
Extreme
Avoid all avalanche
terrain.
Natural and
human-triggered
avalanches
certain.
Large to very
large avalanches
in many areas.
4
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.
3
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.
2
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.
1
Low
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.
17
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