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Avalanche Forecast - South Columbia    


Date Issued   Sunday, 26 February 2012 5:12 PM      Valid Until    Monday, 27 February 2012 4:00 PM
 

Local areas receiving direct sunshine may spike to HIGH danger.

Danger Rating: Monday Alpine Treeline Below Treeline
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
Tuesday Wednesday
Alpine 3 - Considerable 3 - Considerable
Treeline 3 - Considerable 3 - Considerable
Below Treeline 3 - Considerable 2 - Moderate
Confidence: Good
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.

Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Several weaknesses exist in the upper snowpack, now buried by about 1m of snow. These layers are very sensitive to triggers and pose the threat of large, destructive avalanches which could be triggered by the weight of a person.
Travel and Terrain Advice
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Travel on ridgetops to avoid wind slabs on slopes below.
  • Avoid convexities or areas with a thin or variable snowpack.
  • Give cornices a wide berth when travelling on or below ridges.
Wind Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Wind slabs have grown large on many slopes. Persistent weak layers are buried beneath these slabs, meaning they could be touchy and create very large avalanches. Large cornices also threaten many slopes.
Travel and Terrain Advice
  • Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.
  • Travel on ridgetops to avoid wind slabs on slopes below.
  • Avoid convexities or areas with a thin or variable snowpack.
  • Give cornices a wide berth when travelling on or below ridges.

Prepared by pgoddard