The national avalanche danger scale
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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