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Avalanche Forecast

Archived

Dec 10th, 2022–Dec 11th, 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, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Rockies, Bull, Crowsnest North, Crowsnest South, Elkford East, Elkford West.

The alpine and treeline have been heavily wind-affected. Expect wind slabs may be reactive to rider triggering.

A weaker layer further down in the snowpack is still reactive.

Choose terrain that you are sure of and assess conditions as you travel.

Confidence

Moderate

Avalanche Summary

A natural size two avalanche was reported to have released on the weak layer created in mid-November. Our neighbours to the immediate north in Kananaskis Country reported evidence of reactivity of this layer on convex rolls. This same layer continues to be reactive in snowpack testing.

If you head into the backcountry, support your community by submitting a report to the Mountain Information Network. Thank you to those who have.

Snowpack Summary

Since Thursday night up to 20 cm has fallen in some parts of our region. In the alpine and at the treeline strong westerly winds have moved much of this snow around. The new snow and new wind slabs are covering a variety of surfaces, mainly older wind slabs. These were made by winds produced from all directions. It is expected that the wind has built wind slabs upon wind slabs in some areas while in other areas the wind will have stripped away the majority of the snow.

Where the wind had less of an impact on the snow you can expect to find around 10 to 20 cm of soft snow sitting on 30 to 40 cm of more settled snow. Buried 45 to 65 cm down lies a weak layer comprising of surface hoar and facets. This layer has been shown to be reactive in snowpack tests and showed be kept on your radar for the time being. Further down the snow is sugary and faceted with a rain crust near the ground but this lower snowpack appears to be consolidating.

Total snowpack depths at treeline elevations are 75 to 155 cm.

Weather Summary

Saturday Night

Cloudy, 3 to 7 cm accumulation, winds southwest 20 km/h, -3 C at 1500 m.

Sunday

Cloudy with some sunny periods, up to 2 cm accumulation, winds northeast 10 km/h, -8 C at 1500 m.

Monday

A mix of sun and cloud, trace accumulation, winds northeast 15 km/h, -10 C at 1500 m.

Tuesday

Mostly sunny, no accumulation, winds north 10 km/h, -7 C at 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Caution around convexities or sharp changes in 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.