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Avalanche Forecast

Archived

Apr 1st, 2023–Apr 2nd, 2023

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

Regions

North Rockies, Kakwa, McGregor, Pine Pass, Tumbler.

Use extra caution below ridgetops, and in cross-loaded features. Watch for signs of instability like shooting cracks, or fresh avalanches. Wind slabs may slide easily where they sit on a frozen crust.

Confidence

Moderate

Avalanche Summary

There is no avalanche activity to report in the last few days.

Recent snow and wind have made natural and human triggered avalanches more likely.

If you are getting out in the backcountry, consider making a post on the MIN (Mountain Information Network). You can share riding conditions, avalanche or snowpack observations, or even just a photo. Heck, share what you had for lunch if that was the most eventful thing that happened:)

Snowpack Summary

Up to 10cm of soft snow sits over a crust or moist snow on all aspects except north. Moderate southwest wind may have formed deeper, reactive pockets of windslab on leeward slopes. On high northerly slopes, the new snow adds to settling snow from last week that sits on facets and small surface hoar.

The middle of the snowpack is generally well-settled and strong.

A weak layer of large facets is found near the base of the snowpack. This layer is still a concern in shallow snowpack areas.

 

Weather Summary

Saturday

Mostly clear, possibly some cloud in the south end of the forecast area. Isolated spots with light flurries. Moderate southwest ridgetop wind becoming light west. Freezing level falling to valley bottom. Treeline low around -7°C.

Sunday

Mostly sunny in the morning, increasing cloud through the day. No new snow expected, possibly some moderate snowfall starting up around Grand Cache in the evening. Light west or northwest ridgetop wind. Freezing level rising to 1200 m.

Monday

Partly cloudy. Possible trace of snow expected. Light southwest ridgetop wind, possible periods of moderate in the morning. Freezing level at valley bottom in the morning, rising to 1000 m.

Tuesday

Partly cloudy. Possible trace of snow expected. Light variable wind. Freezing level at valley bottom in the morning, rising to 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Keep in mind the crust offers an excellent bed surface for avalanches.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.