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Avalanche Forecast

Archived

Dec 2nd, 2024–Dec 3rd, 2024

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

Regions

Glacier.

Be on the lookout for isolated pockets of wind slab in leeward terrain and in areas with visible wind effect.

Warming temperatures may increase the reactivity of wind slabs.

Confidence

Moderate

Avalanche Summary

Sluffing in steep terrain has been reported by multiple parties in MIN reports over the past few days.

No new natural avalanche activity reported over the past 2 days.

Snowpack Summary

Up to 40cm of low density snow has covered a variety of old snow surfaces. These include wind affected snow in exposed Alpine terrain, 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

Warming trend...

Tonight: Cloudy with clear periods. Ridge wind SW 20-30 km/h. Freezing level (FZL) 800 m. Alpine temperature inversion.

Tues: Cloudy with sunny periods. No precipitation. Alpine high 1 °C. Ridge wind W 15-35 km/h. FZL 1800 m. Weak temperature inversion.

Wed: A mix of sun and cloud. No precipitation. Alpine high 2 °C. Ridge wind SW 15. FZL 2600 m.

Thurs: Flurries. 8 cm snow. Ridge wind SW 20. FZL 1300 m.

Terrain and Travel Advice

  • Wind slabs are isolated, but may remain reactive.
  • Be careful 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.