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Avalanche Forecast

Archived

Feb 26th, 2026–Feb 27th, 2026

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Continued snowfall with strong wind overnight Thursday will increase the storm slab hazard. New snow is adding stress to the buried persistent weak layer and avalanches have been observed stepping down to this layer.

Pick conservative terrain and avoid exposure to overhead hazard.

Confidence

High

  • We are confident the likelihood of avalanches will increase with the forecast weather.

Avalanche Summary

Natural avalanche activity up to size 3 on Thursday with explosives producing results up to size 3.5 in the highway corridor. Many of these avalanches stepped down to the persisant slab.

On Wednesday, field teams triggered small avalanches on a steep north aspects below treeline.

Snowpack Summary

Storm slabs will continue to build with forecasted extreme winds and snowfall.

The incoming storm will further bury persistent weak layers and load them rapidly.

The Feb 9 surface hoar (SH) is down 90-120 cm and remains reactive in snowpack testing. The Feb 9 SH sits over a crust on solar aspects.

The Jan 26th layer, composed of surface hoar/facets/crust, is buried down 130-150 cm. The largest surface hoar is preserved in sheltered areas below treeline.

Weather Summary

An intense storm continues through Friday. A total of 40-60 cm of snow is expected with extreme westerly winds.

Tonight Flurries, 10cm. High -6°C. Wind SW 40 gusting to 90 km/h. Freezing level (FZL) 1300m.

Fri Flurries 5-10 cm. Low -9°C. Winds W 25, gusting to 65 km/h. FZL 900m.

Sat Mix of sun and cloud. No precipitation. High -12°C. Winds West 15-35. FZL 600m.

Sun Mix of sun and cloud. High -4. Winds West 10-20. FZL 1300m.

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Be aware of the potential for large avalanches due to buried surface hoar.
  • Shooting cracks, whumpfs, and recent avalanches are strong indicators of an unstable snowpack.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.