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Avalanche Forecast

Archived

Jan 24th, 2024–Jan 25th, 2024

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

Regions

Blue River, Premier, Clemina, Esplanade, North Monashee, North Selkirk, Dogtooth, West Purcell.

Storm slabs are resting on a layer of facets and will be slow to bond. Reactivity may persist longer than usual.

Be mindful of buried weak layers that have produced large recent avalanches.

Confidence

Moderate

Avalanche Summary

Storm slabs have been reactive, sliding on a facet layer below the recent storm snow. A natural cycle was observed Sunday up to size 2. On Monday and Tuesday, numerous rider-triggered avalanches, (including, ski cuts, accidentally and remotely triggered avalanches) were reported size 1-2.

Buried weak layers have also been active in recent days. Naturals have been reported to size 3, as well as several size 1-2 triggered by riders from shallow, weak or rocky spots.

Snowpack Summary

15 to 30 cm of recent snow sits poorly bonded to old surfaces including faceted snow, surface hoar and firm wind slabs.

The mid pack contains a few layers of concern including a surface hoar/facet/crust layer buried 60 to 80 cm deep.

130+ cm down another surface hoar layer exists that was buried in early December. This seems to be of most concern above 2000 m where a robust crust doesn't exist above it, or in shallow snowpack areas.

Weather Summary

Wednesday night

Mostly cloudy with flurries bringing around 5 cm of new snow. South alpine wind 40 km/h. Treeline temperature -3 °C.

Thursday

Mostly cloudy with flurries brining around 5 cm of new snow. South alpine wind 30-40 km/h. Treeline temperature -2 °C. Freezing level 1300 m.

Friday

5-10 cm of new snow overnight then a mix of sun and cloud. Southwest alpine wind 30-40 km/h, treeline temperature -1 °C, freezing level 1400 m.

Friday

Mostly cloudy with flurries brining around 5 cm of new snow. Southwest alpine wind 40-50 km/h. Treeline temperature 0 °C. Freezing level 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.