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Avalanche Forecast

Archived

Mar 10th, 2025–Mar 11th, 2025

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

Regions

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

Enjoy the fresh snow in simple terrain with no overheard exposure. Natural avalanche cycle is ongoing.

Confidence

Moderate

Avalanche Summary

Bad visibility throughout the day. Several rumbles were heard from the steep headwall in the back of the basin today. On the drive home, there was visible debris below large features and a fresh crown on the SE aspect of tent ridge which ran in to the valley below where most skiers descend from tryst lake basin. Loose dry and sluffs were observed on any feature steep enough.

Snowpack Summary

The storm produced. Field teams in the black prince area today found 70CM of new snow sitting overtop of a sun crust in the tree triangle. This amount seems highly drainage dependant as the weather stations in the burstall pass area recorded 30cm. This new snow now overlies the Jan 30th interface. Below the Jan 30th there is a mostly faceted snowpack to ground with a standout layer about 30cm off the ground of large depth hoar crystals.

Traveling off of established skin tracks at lower elevations is very challenging due to the weak nature of the snowpack. Once higher this becomes easier.

Weather Summary

Tuesday:

Mostly cloudy with sunny periods, isolated flurries. Day time high of -9 with 50km West winds

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Choose simple, low-angle terrain without steep convex rolls.
  • Dial back your terrain choices if you are seeing more than 25 cm of new snow.
  • Be alert to changing conditions throughout the day.
  • Avoid exposure to overhead avalanche terrain; avalanches may run surprisingly far.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Cautiously approach steep slopes that are open or sparsely treed.

Problems

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.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.