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Avalanche Forecast

Archived

Feb 25th, 2025–Feb 26th, 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 possible, human triggered probable.
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-triggered avalanches were the story on Tuesday and this will continue with the warm weather, a cohesive storm slab, and persistent weak layers buried in the upper meter.

Time to practice conservative travel techniques!!

Confidence

Moderate

Avalanche Summary

Connaught Creek was busy, with reports of people remote-triggering avalanches to sz 2 on Video Pk, 8812 Bowl, Dispatcher Bowl, and Balu Pass shoulder.

On Cheops 2, a natural sz 3 storm slab with full propagation across the bowl and adjacent ribs/gullies failed early Mon am.

Low elevation areas (below 1300m) have significant pinwheeling on the surface. Steep solar slopes are releasing moist/loose avalanches to sz 2 with direct sun.

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 to human loads.

Low elevation zones with a thin snowpack should be treated with caution. The cold, weak facets at the base have undergone rapid change and are now nearly isothermal.

Weather Summary

Clouds with sunny breaks, chance of a temp inversion on Thurs am, temps staying mild with no solid refreeze in the valleys.

Tonight Cloud with isolated flurries. Alp low -7°C. Ridge winds W 20-40km/h. FZL 1200m

Wed Cloudy with sunny periods. Alp high 0°C. Ridge wind SW 25km/h. FZL 1600m

Thurs Mix of cloud/sun. Alp high -1°C. Ridge wind SW 30-55km/h. FZL 1600m

Fri Cloudy. Alp high -2°C. Ridge wind W 15km/h. FZL 1700m

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

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.