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Avalanche Forecast

Archived

Dec 16th, 2025–Dec 17th, 2025

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.
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.

Watch for old and hard wind slabs as you transition from sheltered to wind exposed terrain.

The cold weather continues to weaken the general structure of the snowpack.

Confidence

Moderate

Avalanche Summary

Reports of small (size 1) natural wind slab avalanches were reported on Tuesday.

Observations are limited this time of year. Be sure to verify conditions as you go.

If you are getting out in the backcountry, consider sharing your observations on the Mountain Information Network (MIN)!

Snowpack Summary

The upper snowpack is soft in sheltered areas around treeline and mostly hard and sculpted by the wind at alpine elevations.

An average snowpack depth of 110 cm in the alpine tapers with elevation to around 60 cm at the White Pass highway elevation.

Weather Summary

Tuesday Night
Mostly cloudy. 2 cm of snow. 20 km/h northeast ridgetop wind. Treeline temperature -23 °C.

Wednesday
Partly cloudy. 1 cm of snow. 30 km/h northeast ridgetop wind. Treeline temperature -25 °C.

Thursday
Partly cloudy. 1 cm of snow. 30 km/h northeast ridgetop wind. Treeline temperature -27 °C.

Friday
Mostly clear. 30 km/h northeast ridgetop wind. Treeline temperature -30 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Make observations and continually assess conditions as you travel.

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.