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Avalanche Forecast

Archived

Feb 26th, 2022–Feb 27th, 2022

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

Regions

South Rockies.

Lingering wind slabs may still be reactive to human-triggering in exposed terrain at higher elevations. Watch for new wind slab formation in the afternoon if the storm arrives earlier than expected. 

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack. Uncertainty is due to the timing, track, & intensity of the incoming weather system.

Weather Forecast

The first in a series of storm systems is forecast to reach the region on Sunday afternoon. 

Saturday Night: Mainly clear, moderate to strong SW wind, treeline low around -12 °C. 

Sunday: Increasing cloud cover with light snow in the afternoon 2-4 cm, moderate to strong SW wind, treeline high around -3 °C. 

Sunday night and Monday: Snowfall 10-20 cm, moderate to strong SW wind, treeline high around -1 °C.

Monday night and Tuesday: Snowfall 10-20 cm, moderate to strong SW wind, freezing levels reaching around 2000 m. 

Avalanche Summary

No new avalanches were reported on Friday. 

On Thursday, explosives triggered two size 1 wind slabs. The Avalanche Canada field team saw no new avalanches in the Crowsnest area. 

On Wednesday, there were some small isolated wind slabs reported from reverse-loaded features on the Alberta side of the region. 

Snowpack Summary

10-30 cm of recent snow has been redistributed by ongoing wind from various directions over the past week and formed some wind slabs in unusual places. This older storm snow sits over old firm wind-affected snow in exposed areas and hard sun crust on solar aspects.

The middle and lower snowpack are generally well consolidated, with a crust/facet layer from early-December found near the bottom of the snowpack. It is currently considered dormant but could become active later this season. Check out the forecaster blog for more information. 

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.

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.