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Avalanche Forecast

Archived

Dec 13th, 2025–Dec 14th, 2025

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

Regions

Kananaskis, Bow Valley, Highwood Pass, North 40, Spray - KLakes.

More snow is incoming for early next week. Hazard will certainly spike when it arrives, but in the meantime we will remain at Considerable. Winds are causing some problems in the alpine, but lower, and/or sheltered areas have good skiing.

Confidence

High

Avalanche Summary

Numerous cornices collapsed today near Hero's Knob. There was also a small, but deep pocket of sluffing slab that released along the base of the main cliff. There were also 3 or 4 other notable and recent avalanches noted on high east aspects. These all started in the alpine and ran well below treeline.

Snowpack Summary

Another 15cm (on average) came in last night. Our snowpack continues to grow and more or less cooperate with the new load. We have about 40-50 of recent snow that in many lower places is still unaffected by the high elevation winds. The high alpine, east side of the road and some very exposed treeline areas have been wind scoured. but many areas have been spared the full brunt. The Nov crust is down 70-120cm, is still intact and starting to develop facets (loose, sugary snow) on top. It'll become increasingly important to keep tabs on those facets as time goes on. There's a pretty good chance they'll crash our ski party at some point. But until that happens, the skiing is quite good in sheltered areas.

Weather Summary

We'll remain on the edge of this extended westerly weather pattern which will keep us guessing on which forecast to look at. Some say we'll get 30cm by Tuesday morning, and some say 10. Time will tell. In the meantime, Sunday will bring some flurries with trace amounts, strong westerly ridge top winds and warm temperatures. Tomorrow's temperature will hover around -2°. If today is any indication, that temperature could creep even higher.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid areas with overhead hazard.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be mindful that deep instabilities are still present in the snowpack.

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.

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.