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Avalanche Forecast

Archived

Feb 19th, 2021–Feb 20th, 2021

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Kananaskis.

We've had more wind than expected lately. This has, and will continue to dramatically change our snowpack. The avalanche hazard will stay elevated until the wind calms down. 

Confidence

Moderate -

Weather Forecast

The winds today were far stronger than expected. At the moment they are forecasted to be about 30km/hr from the west, but given what we are seeing now, expect that to be much higher. Light flurries and cloud cover are also expected for Saturday. The day time high will be -9. 

Avalanche Summary

Winds were much stronger than expected last night. There were numerous loose dry avalanches out of steep alpine terrain last night and early this morning. In confined gullies the flowing snow pulled out slabs from the sidewalls. Up to sz2. There were also some isolated slabs on aprons below large cliffs.

Snowpack Summary

Watching how quickly the wind changed the snow's distribution over night it is quite clear that the cold snap turned our snowpack into sugar...and now the wind is blowing it all away! I'm sort of kidding. Many areas are blown to gravel, or old hard surfaces, but there are still lots of new windslabs out there. These will be sitting on top of facets, and touchy in steep, wind exposed areas. The good news is the deeper layers are still playing along and not failing. But remember, in times of rapid change (like now) its best to let those layers re-gain your trust. 

Terrain and Travel

  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.
  • Carefully evaluate steep lines for wind slabs.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • If triggered, loose dry avalanches may step down to deeper layers resulting in large avalanches.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.