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Avalanche Forecast

Archived

Mar 13th, 2025–Mar 14th, 2025

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

Regions

Glacier.

Fresh storm slabs continued to build on Thursday with new snow and strong winds.

Human triggered avalanches remain likely.

Stick to conservative, low consequence terrain and give the storm snow more time to settle.

Confidence

Moderate

Avalanche Summary

Thursday's storm triggered a few natural avalanches in the hwy corridor, up to size 2.5. Avalanche control Thursday produced widespread results, triggering avalanches up to size 3.0.

Before Thursdays snowfall, large avalanche debris and fracture lines could be seen in most avalanche paths from last weekends storm. The natural avalanche cycle had avalanches up to size 4, running full path.

A group up the Asulkan had 1 skier partially buried in a size 2 avalanche Sunday.

Snowpack Summary

Up to 20cm of new snow fell Thursday, with strong SW winds. This covers previous thick storm slabs from up to 80cm that fell last weekend, accompanied by periods of extreme SW winds. This slab sits on old breakable crust &/or surface hoar (3-10mm, largest in the alpine).

Two persistent weak layers (PWL) in the heavily facetted snow from cold temps in Jan/Feb are now buried well over a meter. Large triggers such as storm slab avalanches in motion may step-down to these layer.

Weather Summary

A weak ridge gives mixed sun and cloud, with cooling temps heading in to the weekend.

Tonight Isolated flurries. Alpine low -14°C. Ridgetop wind Moderate SW. Freezing level (FZL) valley bottom.

Fri Mixed sun and cloud. Alpine high -11°C. Light SW wind. FZL 900m.

Sat Scattered flurries (5cm). Low -12°C, High -9 °C. Light SW wind. FZL 1100m.

Sun Isolated Flurries. Low -11°C, High -9°C. Light SW wind. FZL 1200m.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • 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.