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Avalanche Forecast

Archived

Dec 26th, 2023–Dec 27th, 2023

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

Regions

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

Seek terrain that is sheltered from the wind for better snow and lower avalanche danger. Winds change direction on Wednesday, so human triggered avalanches are possible on all aspects.

Confidence

Low

Avalanche Summary

No new avalanches have been reported in the region. We anticipate that on Wednesday, the weight of a human could trigger small to large (size 1-2) windslabs on all aspects in terrain exposed to the wind.

If you head into the backcountry please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

50-70 of recent storm snow has been redistributed by varied wind. Wind is forecast to switch direction, blowing from the east on Wednesday. This could form new, reactive windslabs on terrain that was previously scoured or pressed by strong south through west winds.

Below 1200 m, a thick crust is present approximately 50 cm above the ground. This crust is well bonded to the snow around it.

The middle and lower snowpack is reported to be well settled and bonded. Snow depth varies from 75-200 cm through this region.

Weather Summary

Tuesday Night

Clear. No new snow expected. Strong west ridgetop wind. Treeline temperature around -7 °C .

Wednesday

Partly cloudy. No new snow expected. Moderate to strong east ridgetop wind. Treeline temperature around -10 °C.

Thursday

Cloudy. 2-5 cm of snow expected. Light to moderate southeast wind. Treeline temperature around -11 °C. Possible temperature inversion.

Friday

Mostly cloudy. 2-5 cm of snow expected. Light to moderate southeast wind. Treeline temperature around -6 °C. Possible temperature inversion.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

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.