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Avalanche Forecast

Archived

Mar 23rd, 2025–Mar 24th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural and human triggered avalanches likely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.

Regions

Glacier.

A widespread storm slab is developing as temperatures rise over the next few days.

Avoid avalanche terrain until the freezing levels come back down.

Confidence

Moderate

Avalanche Summary

A widespread natural avalanche cycle is expected to begin Sunday evening. Size and frequency will increase as freezing levels rise through Tuesday.

Snowpack Summary

An additional 10- 20cm on Sunday brings our weekly storm total ~70cm. Rising temperatures and recent moderate to strong SW wind has created a wind spread storm slab at all elevations.

The March 5th interface is down 50-100cm and consists of a crust &/or surface hoar.

Two persistent weak layers (PWL) of facetted snow from cold temps in Jan/Feb are now buried 120-160cm beneath the surface.

Weather Summary

Steady moisture and skyrocketing freezing levels continuing into next week.

Tonight Snow ~13cm. Wind SW 20-40 km/h. Freezing level (FZL) 1400m.

Mon Scattered flurries, trace precipitation. Alpine high -3°C. SW winds gusting 45km/h. FZL 1800m.

Tues Snow, 13cm. Wind SW 25-gusting 50km/hr. Alpine high 2°C. FZL 2400m.

Wed Mainly cloudy, trace precipitation. Wind SW 15-25km/h. Alpine high 5°C. FZL 3100m.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Storm slabs in motion may step down to deeper layers resulting in large 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.

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.