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Avalanche Forecast

Archived

Nov 30th, 2024–Dec 1st, 2024

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

Regions

Glacier.

Keep a keen eye for the effects of warming temperatures these next couple of days. New snow could change from light and fluffy to slabby and reactive!

Be prepared to manage your slough where snow is unconsolidated in the alpine at at treeline.

Confidence

Moderate

Avalanche Summary

Moderate southerly winds are building fresh windslabs in exposed alpine areas.

Recent Loose dry avalanches have been observed in the Park. The steep North face of Mt Macdonald has been shedding some of the new snow, producing size 2's just reaching the top of run outs.

Rider triggered sluffing has been noted in recent MIN reports as well.

Snowpack Summary

Up to 40cm of very low density snow has fallen over the past week! This new snow has buried a variety of old snow surfaces. These include: wind affected snow in higher Alpine areas, a crust on solar aspects, and settled storm snow in sheltered terrain.

The Nov 9 crust is down 50-100cm. The base of the snowpack is comprised of several dense, melt-freeze rain crusts formed in October.

Treeline snowpack depths average 110-130cm, falling to 45cm at Rogers Pass (1315m).

Weather Summary

The edge of a warm front will bring light flurries and rising temps to Rogers Pass over the weekend. High pressure sets up in its wake.

Tonight: 5cm of snow. Alp Low -7 °C. SW winds 25km/hr. Freezing Level (FZL): 900m

Sun: Isolated flurries, trace precip. Alp High -4 °C. Light SW winds. FZL: 1500m

Mon: Cloudy with sunny periods. No new snow, Alp High -2 °C. Light SW winds. FZL: 1300m

Tues: Mix skies, no precip. FZL 1500m.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

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.