The national avalanche danger scale

Published: Saturday, Jan. 5 2008 12:29 a.m. MST

The Forest Service's National Avalanche Center uses the following scale for communicating avalanche danger:

• Low Danger: Avalanches are unlikely but may occur in isolated terrain.

• Moderate Danger: Avalanches are infrequent but possible.

• Considerable Danger: Avalanches are probable with human and natural triggers.

• High Danger: Avalanches will occur with human and natural triggers. Backcountry travel is not recommended.

• Extreme Danger: Avalanche Warning is in effect. Avalanches are certain. Do not attempt backcountry travel.

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