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Avalanche Forecast

Archived

Mar 11th, 2026–Mar 12th, 2026

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

Regions

Glacier.

Snowfall and strong winds will be building storm slabs. These will be most reactive at ridgetop and in steep unsupported terrain features.

Recent avalanche cycles have cleaned out many start zones. However, there are still slopes that haven't flushed out the persistent slab problem. Be skeptical of terrain that hasn't avalanched

Confidence

Moderate

  • We are uncertain about forecast snowfall amounts.
  • We are uncertain about how quickly persistent slabs are gaining strength.

Avalanche Summary

We've seen a decrease in natural avalanche activity in the last few days but expect to see that change with the incoming storm.

Artillery control last Sunday produced numerous avalanches from size 2 to 4, in part due to rain at lower elevations and the active PWL at upper elevations.

See the Avalanche Canada blog post for info on dealing with persistent slab problems. Avalanches are becoming less likely but the consequence will remain massive for the foreseeable future.

Snowpack Summary

50-80 cms of new snow has fallen in the Alpine and at treeline since the recent warm-up/rain event. Strong to moderate winds have been moving this snow around in exposed areas

Below Treeline 15-20cm of new snow sits on top of the old refrozen rain crust.

The Feb 9 and Jan 26 surface hoar (SH) layers are now buried 110-170cm deep. The Jan 26th layer is a crust with either surface hoar (up to 40mm in some places!) or facets on top of it.

Weather Summary

An incoming storm will bring snow and strong winds.

Tonight Flurries, 15-20cm. Alpine low -9°C. Freezing level (FZL) 700m. Winds SW 20km/h gusting to 115km/hr

Thurs Flurries, 5cm. Alp High -8°C. Wind: W 30 gusting 55km/hr. FZL 700m.

Fri Cloud/Sun/Flurries, Precip: 1-2cm. Alp High -13°C. Wind W 20km/h. FZL Valley Bottom.

Wed Snow, 15cm. Alp High -12°C. Wind SW 25-40km/h. FZL VB.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Watch for fresh storm slabs building throughout the day.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.