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Avalanche Forecast

Archived

Mar 13th, 2026–Mar 14th, 2026

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

Regions

Glacier.

Human triggering of the new surface slab remains possible.

Use extra caution if you transition into wind affected terrain.

Confidence

High

  • We have a good understanding of the snowpack structure and confidence in the weather forecast.

Avalanche Summary

Natural avalanches up to size 3 were observed along the highway corridor Thursday morning. These avalanches mostly failed in the recent storm snow, primarily in the steep terrain east of Rogers Pass.

Effective artillery control on Sunday produced widespread avalanches size 2-4.

For information on how to deal with persistent slab problems, see the Avalanche Canada blog post. Avalanches are happening less often, but when they do occur, the consequences are very serious.

Snowpack Summary

In the Alpine and at Treeline, 30-80cm of storm snow has fallen since Mar 8. Moderate to strong southerly winds have loaded lee features in exposed terrain.

Below treeline, 20-30 cm of storm snow covers the Mar 8 rain crust, which is present up to ~1800m.

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

Lingering instability brings mixed skies over the weekend. Early next week, a warm, wet airmass moves in.

Tonight Clear periods. Alpine low -13°C. Wind NW-15km/h. Freezing level (FZL) at valley bottom.

Sat Cloud/Sun/Flurries, Trace snow. High -13°C. Wind NW 15-35km/h. FZL 500m.

Sun Cloud/Sun/Flurries, Trace snow. Alp High -12°C. Wind: SW 25km/h. FZL 600m.

Mon Snow, 19cm. High -4°C, FZL 1200m. Wind SW-30 km/h

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Be careful as you transition into wind-affected terrain.

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.