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Avalanche Forecast

Archived

Nov 23rd, 2020–Nov 24th, 2020

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

Regions

Kananaskis.

Good quality skiing in sheltered areas, but watch for surface wind slabs as well as persistent slabs on the Nov crust. These both could be triggered in steeper and/or wind affected terrain.

Confidence

Moderate -

Weather Forecast

Tuesday will see winds steadily increasing through the day, eventually reaching up to 100km/h from the SW by mid-afternoon. There is a possibility of very light flurries later in the day. Temperatures should reach -4C at 2200m. Most weather models are calling for 10cm of snow to fall on Wednesday.

Avalanche Summary

Nothing new today, but there is evidence of small loose dry avalanches and some cornice failures triggering slabs on the underlying slopes. Generally speaking all of this activity has been size 1.5 or smaller, but there could be bigger events out there. 

Snowpack Summary

Snow profiles today in the Burstall Pass region indicate significant faceting above the Nov crust layer. The crust is buried 50 to 80cm deep and is producing moderate to hard compression test failures. In wind prone areas such as gullies and the lee side of ridges surface wind slabs 10 to 20cm thick have been observed. Some cornice growth, and a few failures, have been observed in recent days. Overall the snowpack carries fairly well once above 2000m, but it is still relatively shallow with lots of slightly hidden hazards (rocks, stumps, etc.) lurking beneath.

Terrain and Travel

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Approach lee and cross-loaded slopes with caution.

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.