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Avalanche Forecast - South Columbia    


Date Issued   Friday, 20 January 2012 5:13 PM      Valid Until    Saturday, 21 January 2012 4:00 PM
Danger Rating: Saturday Alpine Treeline Below Treeline
4 - High Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
4 - High Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
Sunday Monday
Alpine 4 - High 3 - Considerable
Treeline 3 - Considerable 3 - Considerable
Below Treeline 3 - Considerable 2 - Moderate
Confidence: Fair - Freezing levels are uncertain on Saturday
Learn more about danger ratings
Low Moderate Considerable High Extreme

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.

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.

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.

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.

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

Storm Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
A classic recipe for storm slabs is evolving: heavy snowfall with rising temperatures landing on loose dry snow. Storm slab avalanches are likely, especially in steep or convex terrain.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Avoid lingering in runout zones.
Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Strong winds will shift available snow into wind slabs on downwind slopes. Older buried wind slabs also exist.
Travel and Terrain Advice
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Avoid lingering in runout zones.

Prepared by pgoddard