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Avalanche Forecast

Archived

Nov 27th, 2022–Nov 28th, 2022

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

Regions

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

Up to 40cm of recent snow in the past 48 hours, coupled with periods of strong winds have elevated the avalanche hazard. Conservative route-finding is in order.

Confidence

Moderate

Avalanche Summary

Observations were very limited due to poor visibility, but one report was received from an ACMG Guide in the Dog Leg area. He reported a size 2.0 loose dry on a NE aspect that ran into typical ski lines. It is estimated that this slide occurred Sunday morning. Forecasters expect more widespread avalanche activity due to the rapid loading, but this is unconfirmed.

Snowpack Summary

30 to 40cm of snow has fallen in the past 48 hours with much more in wind drifted areas. This rapid loading has led to a surface instability with loose dry avalanches running in steeper terrain. Due to poor weather, observations are limited at upper elevations, but forecasters expect wind slabs to be present in lee and cross-loaded features due to the recent strong winds. There is also a potential for reverse wind loading due to northerly winds in the last 24 hours. Therefore, expect wind slabs on all aspects in the alpine.

Weather Summary

Monday will bring much cooler temps (-20ish) under mainly cloudy skies and light northerly winds. Wind-chill values could be brutal! Light flurries will fall on Monday with accumulations near 3cm. Tuesday will be mainly sunny and cold, while Wednesday will warm up slightly with more snow expected.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Ice climbers should be equipped with avalanche safety gear.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.

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.

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.