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Avalanche Forecast

Archived

Mar 29th, 2026–Mar 30th, 2026

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, human triggered possible.
Below Treeline
Below Threshold.

Regions

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

Wind slabs and persistent slabs remain possible to trigger.

Sticking to low-consequence terrain is recommended.

Confidence

Moderate

  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.

Avalanche Summary

Over the past few days, there has been evidence of large cornice falls and wind slabs up to size 2. A very large size 3 cornice-triggered slab that may have run on a persistent weak layer also occurred just outside the bulletin area on Saturday. Whumpfing and shooting cracks (clear signs of instability) were also described in this recent MIN post.

While it's outside the forecast area, this great MIN from Whitehorse describes conditions there.

Snowpack Summary

Strong winds left behind stubborn wind slabs and hard, wind-affected surfaces. Some good riding and soft powder may still be found in wind-sheltered locations at lower elevations.

The mid to lower snowpack is very weak and faceted, creating a persistent problem. Upper treeline or lower alpine features where the snowpack rapidly transitions from thick to thin are the most likely places to trigger these deep weak layers.

Weather Summary

Saturday Night
Clear skies. 10 km/h north ridgetop wind. Treeline temperature -14 °C.

Sunday
Mostly sunny. 10 km/h northwest ridgetop wind. Treeline temperature -15 °C.

Monday
Mix of sun and clouds. 10 km/h southwest ridgetop wind. Treeline temperature -13 °C.

Tuesday
Mostly cloudy. 0 to 2 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large avalanches due to buried weak layers.
  • Carefully evaluate steep lines for wind slabs.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

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.

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.