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Avalanche Forecast

Archived

Mar 9th, 2025–Mar 10th, 2025

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

Regions

Glacier.

Heavy snowfall and strong winds have created dangerous avalanche conditions.

Now is a great time to visit your local ski hill and avoid avalanche terrain in the backcountry!

Confidence

High

Avalanche Summary

A large natural avalanche cycle (up to size 3.5) began overnight Saturday into Sunday due to large snowfall amounts and strong southerly winds. Several avalanches have reached the ends of their runouts.

A group up the Asulkan Valley triggered a size 2 avalanche today, which partially buried one of their party members.

Avalanche control is beginning in the highway corridor at 4pm today.

Snowpack Summary

Up to 50cm of snow (and counting!) has been combined with moderate to strong southerly winds. This new snow buries a variety of 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) 70-110cm down. Feb 16 is another PWL (facets/crust/surface hoar) down 60-90cms.

Weather Summary

The atmospheric river is forecast to transit out of BC Monday morning.

Tonight Flurries, 12cm. Ridge winds west 20km/h gusting to 80. Freezing level (FZL) 900m.

Mon Cloudy with flurries. Trace accumulations. SW wind 15 gusting 40km/hr. FZL 1100m

Tues Cloudy, trace of snow. Alp high -6°C. Light ridge winds. FZL 1300m.

Wed Flurries, 9cm. Light ridge wind. Alp high -4°C. FZL 1400m.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be aware of the potential for larger than expected storm slabs due to buried surface hoar.
  • 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.