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Avalanche Forecast

Archived

Feb 22nd, 2021–Feb 23rd, 2021

Alpine
Natural and human triggered avalanches likely.
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.

Wind slabs are widespread due to 25cm of fresh snow and extreme SW winds. Hazard levels are elevated. Avoid avalanche terrain.

Confidence

Moderate -

Weather Forecast

Although wind speeds will decrease from what we experienced Sunday night and Monday morning, Tuesday will still have west to north-west winds at 50km/h at ridgetop. Another 5 to 10cm are possible by midday Tuesday and temperatures should reach a high of -10.

Avalanche Summary

No new naturally triggered avalanches were observed today due to very poor visibility. However, it is expected that a natural cycle is on-going. Avalanche control on EEOR today produced slides ranging from size 2 to 2.5. Some avalanches produced good propagation and due to the loose facets in the tracks, the slides ran far.

Snowpack Summary

Field observations in the Spray Valley were limited today due to avalanche control operations on EEOR. Weather stations indicate that up to 25cm of new snow fell at Treeline elevations. Winds through the storm were extreme from the SW, so widespread wind slab conditions are expected. In the Alpine these slabs could be very dense, whereas at Treeline the slabs may be more soft in nature and potentially more human-triggerable. All lee and cross-loaded terrain should be approached with caution. Slab depths and sensitivity to triggering will be highly variable, so be mindful of rapidly changing conditions as you travel through the terrain.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Watch for areas of hard wind slab on alpine features.
  • Avoid lee and cross-loaded terrain.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.