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Avalanche Forecast

Archived

Mar 27th, 2026–Mar 28th, 2026

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.

Avalanche hazard is decreasing, but a buried persistent weak layer can still produce large, distructive avalanches.

Conditions Update Here

Confidence

Moderate

  • We are uncertain due to a limited number of field observations.
  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.

Avalanche Summary

A large, rider-triggered persistent slab avalanche occurred last Sunday on the east side of White Pass. Behind the Big Y, a snowmobiler triggered a size 2 avalanche on a west-facing alpine slope near a thin rocky area. The avalanche failed on facets near the ground.

More recently, evidence of natural wind slab avalanches has been observed. Wind slabs may remain reactive to riders with ongoing wind and snow transport.

Snowpack Summary

Strong winds have left stubborn wind slabs and wind-affected surfaces. Up to 30 cm of facetted and settling powder is found in sheltered areas and lee features; this covers old wind-affected snow.

Prolonged cold temperatures this winter have resulted in a very faceted mid to lower snowpack. Normally, thick and stiff wind-hardened layers would lower the likelihood of triggering these facets, but these layers are lacking their usual strength. Thick to thin upper treeline or lower alpine features are the most likely place to trigger weak layers in the mid and lower snowpack.

Cornices are large and looming. A large cornice fall could trigger persistent layers deeper in the snowpack.

Weather Summary

Friday Night

Clear skies. 20 km/h northeast ridgetop wind. Treeline temperature -16 °C.

Saturday

Mix of sun and clouds. 10 km/h northeast ridgetop wind. Treeline temperature -17 °C.

Sunday

Mix of sun and clouds. 10 km/h south ridgetop wind. Treeline temperature -15 °C.

Monday

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

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Carefully evaluate steep lines for wind slabs.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.