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North Columbia

Recent strong Southwest winds have created widespread wind slab in the alpine and upper treeline. carefully assess the wind slab hazard as you gain elevation.

Danger ratings

Alpine
3 - Considerable
Treeline
2 - Moderate
Below Treeline
1 - Low
Alpine
2 - Moderate
Treeline
2 - Moderate
Below Treeline
1 - Low
Alpine
2 - Moderate
Treeline
1 - Low
Below Treeline
1 - Low

Travel and Terrain Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

Problems

Avalanche Problem 1: Wind Slab

What Elevation?
What Elevation? Treeline, Alpine
Which Slopes?
Which Slopes? North, Northeast, East, Southeast, south, Southwest, West, Northwest
Chances of Avalanches?
Chances of Avalanches? Likely
Expected Size?
Expected Size? Small - Large

Large wind slabs will be found in the alpine and upper treeline. These slabs will remain sensitive to rider traffic. Avoid wind loaded terrain.

Details

Avalanche Summary

On Wednesday several operations reported a widespread natural cycle up to size 3.5 including avalanches running full path.

Snowpack Summary

Recent strong winds have formed wind slab in all exposed terrain in Alpine and upper treeline. A new crust has formed below 2000m with moist snow underneath.

The average snowpack depth at treeline is 250cm.

Weather Summary

Thursday night: Freezing levels will fall to valley bottom. No precipitation is expected. Winds will be moderate from the West in the Alpine.

Friday: A ridge of high pressure will mean clear skies and light alpine winds. Freezing level will be at valley bottom.

Saturday: Temperature at 1500m -10. moderate to strong winds from the Northwest.

Sunday: high of -10 at 1500m, moderate winds from the Northwest in the alpine. No snow expected.

Confidence
Moderate

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Read the Thursday, December 2, 2021 avalanche forecast
Danger Ratings Explained

1 - Low

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.

2 - Moderate

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.

3 - Considerable

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.

4 - High

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.

5 - Extreme

Avoid all avalanche terrain.

Natural and human-triggered avalanches certain.

Large to very large avalanches in many areas.

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List of avalanche forecast RSS feeds

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  • South Coast — https://avalanche.ca/api/forecasts/south-coast.rss
  • South Coast Inland — https://avalanche.ca/api/forecasts/south-coast-inland.rss
  • South Columbia — https://avalanche.ca/api/forecasts/south-columbia.rss
  • South Rockies — https://avalanche.ca/api/forecasts/south-rockies.rss
  • Yukon — https://avalanche.ca/api/forecasts/yukon.rss
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