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Avalanche Forecast

Archived

Feb 4th, 2025–Feb 5th, 2025

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.
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.

Use extra caution in areas where the snowpack changes from thick to thin, especially near ridge crests.

This is where triggering avalanches is most likely

Confidence

Moderate

Avalanche Summary

No new avalanches were reported yesterday. Our field team observed some old size 1 wind slab avalanches that likely occurred over the weekend. Check out their MIN for more info.

There have been no recent reports of persistent slab avalanches, but uncertainty remains regarding the early December layer mentioned in the snowpack summary.

Snowpack Summary

15 to 25 cm of old storm snow has been redistributed into hard wind slab by moderate northerly winds.

A weak layer of facets and a crust from early December is buried 50 to 100 cm deep. This layer exists on all aspects up to around 1700 m.

At the highway elevation the snow is 120 cm deep and in the alpine exceeds 200 cm.

Weather Summary

Tuesday Night

Mostly clear skies. 15 to 30 km/h northeast ridgetop wind. Treeline temperature -22 °C, potential for temperature inversion with warmer temperatures in the alpine.

Wednesday

Mix of sun and cloud. 15 to 30 km/h northeast ridgetop wind. Treeline temperature -16 °C.

Thursday

Mix of sun and cloud with trace amounts of snow. 20 to 40 km/h northeast ridgetop wind. Treeline temperature -16 °C.

Friday

Mix of sun and cloud. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -18 °C, potential for temperature inversion with warmer temperatures in the alpine.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind-loaded terrain features.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.