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Avalanche Forecast

Archived

Mar 20th, 2026–Mar 21st, 2026

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

Regions

Glacier.

Approximately 140mm of precipitation was delivered by the recent Atmospheric river with freezing levels around 2000m. Give the new snow time to settle before stepping out into consequential terrain.

Travel at lower elevations will be treacherous!

Confidence

Moderate

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

Avalanche Summary

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

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

Snowpack Summary

In the alpine, up to 140cm of recent snow has been redistributed by strong winds. At tree line and below (approx. 2000m) heavy rain has saturated the upper snowpack. This moist snow will refreeze on Friday morning.

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

Weather Summary

Freezing levels are dropping.

Tonight Isolated flurries, trace precipitation. Alpine low -7°C. Winds SW 30 gusting to 90km/h. Freezing level (FZL) 1100m.

Sat Cloudy, sunny periods. Alpine high -8°C. Wind W 20-30km/h. FZL 1100m.

Sun Sunny periods, isolated flurries. Trace precipitation. Alpine high -9°C. Wind SW 20-40km/h. FZL 1000m.

Mon Cloudy, sunny periods. Alpine high -4°C. Wind SW 15-30km/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.