featured sponsor

related incidents

forecast sponsor

Avalanche Forecast - South Columbia    


Date Issued   Thursday, 22 December 2011 5:15 PM      Valid Until    Friday, 23 December 2011 4:00 PM
Danger Rating: Friday Alpine Treeline Below Treeline
3 - Considerable Dangerous avalanche conditions. Careful snowpack evaluation, cautious route finding and conservative decision making essential.
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
2 - Moderate Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Saturday Sunday
Alpine 3 - Considerable 3 - Considerable
Treeline 3 - Considerable 2 - Moderate
Below Treeline 2 - Moderate 2 - Moderate
Confidence: Fair - Due to variable snopack conditions
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?
Wind slabs are sliding easily on the recently buried surface hoar. Shifting winds have set up this problem on a variety of aspects, particularly north through south east.
Travel and Terrain Advice
  • Dig down to find and test weak layers before committing to a line.
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Use ridges or ribs to avoid pockets of wind loaded snow.
  • Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.
Persistent Slabs
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Right now this is more of a concern in the northwest corner of the region. As more snow falls, this problem will increase across the rest of the region. Most pronounced on sheltered, shady aspects (i.e. large, open glades facing north and east).
Travel and Terrain Advice
  • Dig down to find and test weak layers before committing to a line.
  • Avoid open slopes and convex rolls at and below treeline where buried surface hoar may be preserved.
  • Use ridges or ribs to avoid pockets of wind loaded snow.
  • Whumpfing, shooting cracks and recent avalanches are all strong inicators of unstable snowpack.

Prepared by mpeter