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Avalanche Forecast

Archived

Mar 19th, 2026–Mar 20th, 2026

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
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.

Regions

Glacier.

A heavy, rain soaked snowpack is producing lots of avalanche activity with many slides running full path and breaking trees.

Avoid all avalanche terrain.

Confidence

High

  • We are confident the likelihood of avalanches will increase with the forecast weather.
  • Deep persistent slabs could become more likely with the forecast weather.

Avalanche Summary

Explosive triggered avalanches up to size 4 in the highway corridor on Thursday.

On Monday night and again Wednesday morning avalanche control produced avalanches up to size 3.5 throughout the highway corridor.

Natural avalanche activity has continued throughout this storm cycle.

Snowpack Summary

60-120cms of new snow (elevation dependent; more up high, less down low) has been redistributed by strong winds in the alpine. At tree line and below heavy rain has soaked and destabilized the upper snowpack.

The Feb 9 and Jan 26 surface hoar (SH) layers are now buried 150-210 cm deep. With the heavy new load of snow and rain these layers could become reactive again.

Weather Summary

Heavy snow in the alpine and heavy rain tree line and below with strong winds.

Tonight Snow, 17cm. Alpine high 0°C. Winds SW 30-50km/h. Freezing level (FZL) 2100m.

Fri Snow 23cm. Alpine high 0°C. Wind SW 25gusting to 70km/h. FZL 1900m.

Sat Flurries 5cm. Alpine high -5°C. Wind W 20 gusting 55km/h. FZL 1500m.

Sun Isolated flurries. Trace snow. Alpine high -7°C. Wind SW 20-40km/h. FZL 1200m.

Terrain and Travel Advice

  • Avoid exposure to overhead avalanche terrain; avalanches may run surprisingly far.
  • Keep in mind that the high density of wet avalanches can make them destructive.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.

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.

Wet Slabs

Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.

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.