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Avalanche Forecast

Archived

Feb 24th, 2025–Feb 25th, 2025

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

Regions

Glacier.

Man oh man! Is it ever wonderful to finally get a reset on the snowy slopes!? However...

The storm slab is perched atop weak, sugary facets. Tests on this new layer indicate human triggering is possible/likely, especially on unsupported features.

Adjust your objectives and stick to supported terrain with limited overhead hazards.

Confidence

Moderate

Avalanche Summary

Natural avalanche activity has slowed down but still present in the hwy corridor. From Saturday night through Sunday, well over 150 avalanches were recorded from artillery and natural triggers.

Folks up the Connaught reported Frequent Flyer and Cheops N4 had avalanche debris into the valley on Sunday afternoon.

Low elevation areas (below 1000m) with a thin, faceted snowpack (ie Beaver Valley) purged their slopes after the warm sun baked them.

Snowpack Summary

40cm of heavy storm snow sits on a faceted upper snowpack. Strong to extreme SW winds created windslabs at Alpine and Tree-line elevations.

A weak layer of surface hoar, facets and/or suncrust (Jan 30th) is 50-80cm down. This layer is easy to pick out in the snowpack and is reactive in tests.

Low elevation zones with a thin snowpack should be treated with caution. The cold, weak facets at the base are now overloaded by the heavy, warm storm snow.

Weather Summary

Clouds, flurries, and freezing levels (FZL) around 1500m the next couple of days.

Tonight Cloud & sun with isolated flurries. Alp low -5°C. Ridge winds SW 10-30km/h. FZL 1300m

Tues Cloudy with sunny periods. Trace snow. Alp high -4°C. Ridge wind SW 15-25km/h. FZL 1600m

Wed Cloudy. Alp high -2°C. Ridge wind SW 20km/h. FZL 1400m

Thurs Cloudy, isolated flurries. Alp high -2°C. Ridge wind SW 40km/h. FZL 1500m

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Keep your guard up at all elevations. Wind slab formation has been extensive and could extend into openings below treeline.

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.