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Avalanche Forecast - South Columbia    


Date Issued   Tuesday, 13 December 2011 4:48 PM      Valid Until    Wednesday, 14 December 2011 4:00 PM
Danger Rating: Wednesday Alpine Treeline Below Treeline
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
1 - Low Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
1 - Low Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Thursday Friday
Alpine 2 - Moderate 2 - Moderate
Treeline 2 - Moderate 1 - Low
Below Treeline 1 - Low 1 - Low
Confidence: Fair - Intensity of incoming weather is uncertain
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.

Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Hard windslabs linger in isolated lee locations in the alpine.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Carefully evaluate and use caution around thin snowpack areas.
Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Highly variable snow depths make this very difficult to predict. Weaker thin spots on convexities or around protruding rocks/clumps of small trees may be likely trigger locations for deeper avalanches.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Carefully evaluate and use caution around thin snowpack areas.

Prepared by mpeter