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Avalanche Forecast

Archived

Mar 21st, 2026–Mar 22nd, 2026

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

Regions

Glacier.

Last weeks snowfall needs time to settle. Human triggering remains likely in the Alpine.

Travel at lower elevations is very challenging!

Confidence

Moderate

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

Avalanche Summary

Avalanche activity has slowed down.

A widespread, natural avalanche cycle occurred up to size 3.5 in Rogers Pass Thursday and Friday. Explosive avalanche testing also produced results up to size 4 on Friday afternoon.

Many storm slab avalanches stepped down to persistent weak layers resulting in large avalanches, running full path.

Check out some of the excellent MIN Reports with pics from the recent avalanche cycle.

Snowpack Summary

In the alpine, up to 140cm of recent snow has been redistributed by strong winds. At tree line and below, a thick crust has formed on the surface.

Below the recent storm snow, a crust from early March is buried 60-140 cm deep.

The Feb 9 and Jan 26 surface hoar layers are now buried 150-210 cm deep. These problems have become less active with the colder temperatures but the persistent weak layer will need time to adjust to the recent snow load.

Weather Summary

Drying trend.

Tonight Isolated flurries, trace precipitation. Alpine low -12°C. Winds SW 25 to 45km/h. Freezing level (FZL) valley bottom.

Sun Cloudy, isolated flurries. Trace precipitation. Alpine high -9°C. Wind SW 25-45km/h. FZL 1100m.

Mon Mainly cloudy. No precipitation. Alpine high -5°C. Wind SW 15 gusting 45km/h. FZL 1500m.

Tues Snow, 11cm. Alpine high -4°C. Wind S 10-30km/h. FZL 1500m.

Terrain and Travel Advice

  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.

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.