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Avalanche Forecast

Archived

Mar 7th, 2025–Mar 8th, 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 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 possible, human triggered probable.

Regions

Glacier.

Storm Incoming!!

Heavy snowfall and strong winds will drive up avalanche hazard throughout the day.

Confidence

Moderate

Avalanche Summary

Loose/dry surface sluffing has been easily triggered by riders & snow sliders, this will continue as the new snow falls.

Evidence is still visible of the large natural avalanche cycle from earlier in the week triggered by the high freezing levels and strong sun.

Snowpack Summary

Up to 5-15cm of snow recently buried variable surfaces, including a breakable crust, widespread surface hoar, and sastrugi in the Alpine.

Lurking below this is a persistent weak layer (PWL) of surface hoar, facets and/or suncrust (Jan 30th) 50-80cm down. Feb 16 is another PWL (facets/crust/surface hoar) down 30-40cms. Both of these layers are reactive to human triggering, and are present/reactive in lesser traveled areas within the park (ie Bostock Pass).

Weather Summary

A storm system arrives Saturday morning, bringing warm temps, heavy snowfall and strong winds.

Tonight Cloudy with nil precip, Alpine low -7°C. Southwest ridge winds 25km/h. Freezing level (FZL) 1100m

Sat Snow 10-15cm. Alp high -4°C. SW wind 30 gusting 65km/h. FZL 1500m

Sun Heavy snow. 25-30cm. Alp high -4°C. Ridge wind SW 25 gusting 75km/h. FZL 1500m

Mon Mix of sun/cloud. SW wind 15 gusting 40km/hr. FZL 900m

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Storm slabs in motion may step down to deeply buried weak layers and result in very 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.