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Avalanche Forecast

Archived

Dec 26th, 2024–Dec 27th, 2024

Alpine
Natural avalanches unlikely, human triggered possible.
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.

Alpine is largely windblasted while treeline had the right mix of shelter and exposure for new wind slabs to form. Seek out sheltered snow or keep it low angle if you find it's in short supply!

Confidence

High

Avalanche Summary

No new avalanches have been reported in the region, however observations have been limited.

Please share your own observations through the Mountain Information Network.

Snowpack Summary

Steady light snowfall and southeast wind has formed deeper deposits on north aspects and scoured or pressed south-facing slopes.

By Friday morning, 25 to 40 cm of accumulated snow should overlie the supportive early-December crust complex, which extends up to 1500 m. About half this amount arrived Wednesday through Thursday night.

A recent MIN report describes well-preserved surface hoar sitting on this crust in the Powder Valley. This setup is worth investigating throughout the region as slabs that form over this grain could be surprisingly touchy.

Despite the presence of faceted grains in the lower snowpack, there are no layers of concern below the crust. Snowpack depths range from about 70 to 180 cm.

Weather Summary

Thursday night

Cloudy with continuing flurries bringing up to 5 cm of new snow. 30 to 60 km/h southwest ridgetop wind, easing. Treeline temperature -5 °C.

Friday

Mostly cloudy with scattered flurries and a trace of new snow. 15 to 25 km/h southwest ridgetop wind shifting southeast. Treeline temperature -6 °C.

Saturday

Mainly cloudy with scattered flurries bringin less than 5 cm of new snow. 15 to 25 km/h south ridgetop wind. Treeline temperature -7 °C.

Sunday

A mix of sun and cloud. 5 to 15 km/h northeast ridgetop wind. Treeline temperature -12 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • 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.