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Avalanche Forecast

Archived

Apr 12th, 2022–Apr 13th, 2022

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

Regions

South Rockies.

Small wind slabs are expected to remain reactive on Wednesday in exposed high elevation terrain. Reverse loading by easterly winds means wind slabs may have formed in unusual places.

Confidence

Low - Uncertainty is due to the limited number of field observations. Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Tuesday night: Mainly cloudy with a chance of flurries, light to moderate northeast wind, treeline low around -14 °C.

Wednesday: Mainly cloudy with a chance of flurries and sunny breaks, light to moderate northeast wind, treeline high around -10 °C.

Thursday: Mainly cloudy with sunny breaks, light northeast wind, treeline high around -8 °C.

Friday: Mainly cloudy with sunny breaks, light variable wind, treeline high around -6 °C.

Avalanche Summary

No new avalanches were reported over the past few days. On Tuesday in the neighbouring Flathead area, the Avalanche Canada field team reported a couple natural size 1-1.5 wind slabs in steep leeward features in the alpine. Conditions are expected to be similar in the South Rockies.

Observations are very limited this time of year. If you are getting out in the backcountry, please consider contributing to the Mountain Information Network.  

Snowpack Summary

10-20 cm of recent snowfall has buried a widespread melt-freeze crust which formed during the major warming event at the end of last week. Recent periods of strong wind from the northeast through southeast on Monday and Tuesday are expected to have redistributed the recent snowfall in exposed high elevation terrain forming small new wind slabs which sit on a firm crust. 

The middle and lower snowpack are currently well settled and strong.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.