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Avalanche Forecast

Archived

Dec 4th, 2024–Dec 5th, 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 possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Warm temps and strong solar input may trigger loose, wet sluffs in steep South and West facing terrain.

Use caution travelling on and under these slopes, especially if the surface is moist.

Confidence

Moderate

Avalanche Summary

Loose avalanches have been observed this week. Dry loose avalanches/sluffing has been rider triggered in steep terrain with powder snow. Wet loose avalanches have been solar triggered above the valley cloud in steep terrain facing the sun.

Snowpack Summary

Surface hoar and sun crust on steep solar aspects are present at Treeline and into the Alpine. Below this, 20-40 cm of settled storm snow sits on various old surfaces, including: wind affect in exposed Alp terrain and a crust on solar aspects.

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

Treeline snowpack depths approx. 120 cm, with 40 cm at Rogers Pass (1315m).

Weather Summary

Valley cloud and warm air aloft will get pushed out by an incoming storm on Friday.

Tonight: Valley cloud, Alp low -1°C, light winds, 1600m Freezing Level (FZL)

Thurs: Valley cloud, Alp high 1°C, light SW winds,1700m FZL.

Fri: Flurries, 10cm, Alp high -1°C, mod SW winds,1500m FZL.

Sat: Snow, 15-25 cm, Alp high -2°C, mod SW winds, 1500m FZL

Terrain and Travel Advice

  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • Wind slabs are isolated, but may remain reactive.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.