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Avalanche Forecast

Archived

Dec 1st, 2024–Dec 2nd, 2024

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West.

Start on small slopes and watch for signs of instability like shooting cracks or recent avalanches.

The avalanche danger is based on new snow not bonding well to the old surface.

Confidence

Low

Avalanche Summary

No new avalanches have been reported.

Early season observations are very limited. Please consider sharing your observations with forecasters and the backcountry community through the Mountain Information Network.

Snowpack Summary

New snow falling with moderate southwest wind could form reactive windslabs in leeward terrain.

In the alpine and exposed areas at treeline, this new snow is falling on hard, wind-affected surfaces. In lower elevation sheltered trees, it will cover weak surface hoar and facets.

The remainder of the snowpack is generally strong, with some crusts near the base.

Snow depths vary significantly across the region, with about 50 cm at treeline and up to 100 cm in alpine areas.

Weather Summary

Sunday Night

Cloudy with 5 to 10 cm of snow expected. 25-35 km/h southwest ridgetop wind. Treeline temperature -17°C, temperature inversion with -10°C above 1600 m.

Monday

Cloudy with 10 to 15 cm of snow expected. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -7°C, temperature inversion with -5°C above 1800 m.

Tuesday

Cloudy with 3 to 7 cm of snow expected. 25 to 35 km/h south ridgetop wind. Treeline temperature -12°C, temperature inversion with -5°C above 1800 m.

Wednesday

Mostly cloudy with 2 to 5 cm of snow expected. 45 to 70 km/h ridgetop wind. Treeline high 2 °C in potential above freezing layer.

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.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.