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Avalanche Forecast - South Columbia    


Date Issued   Thursday, 09 February 2012 5:21 PM      Valid Until    Friday, 10 February 2012 11:00 AM
Danger Rating: Friday 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.
Saturday Sunday
Alpine 2 - Moderate 2 - Moderate
Treeline 1 - Low 1 - Low
Below Treeline 1 - Low 1 - Low
Confidence: Good - -1
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?
Moderate winds from earlier in the week have set up wind slabs on lee features at higher elevations. They should be gaining strength, but rider triggering may still be possible.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Give cornices a wide berth when travelling on or below ridges.
  • Make observations and assess conditions continually as you travel.
Cornices
What Elevation Zone?
Which Slopes?
Chance of Avalanches?
Expected Size?
Large and unsupported cornices exist in the alpine. Failing cornices are destructive by themselves and have potential to trigger avalanches on the slope below.
Travel and Terrain Advice
  • Be cautious as you transition into wind affected terrain.
  • Give cornices a wide berth when travelling on or below ridges.
  • Make observations and assess conditions continually as you travel.

Prepared by jlammers