Avalanche Forecast

Issued: Jan 24th, 2024 4:00PM

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Storm Slabs and Persistent Slabs.

Avalanche Canada ahanna, Avalanche Canada


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




Avalanche Summary

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

On Monday, natural avalanches up to size 3 were suspected to have run on deeper weak layers in the Valhallas.

Snowpack Summary

Ongoing flurries continue to accumulate over 30 to 50 cm of recent snow. This snow sits over facets, surface hoar and wind-hardened snow, depending on elevation.

A few layers of note exist in the mid snowpack, including another crust/facet/surface hoar layer now buried 60-80 cm deep and a layer of surface hoar 130+ cm deep that was buried in early December. This layer is of most concern above 2000 m where a robust crust doesn't exist above it.

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.


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.


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.


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

  • Keep in mind that human triggering potential persists as natural avalanching tapers off.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • 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.


Storm Slabs

An icon showing Storm Slabs

Recent snow is poorly bonded to underlying surfaces. Storm slabs have been reactive to human triggers in recent days.

Aspects: All aspects.

Elevations: All elevations.


Likely - Very Likely

Expected Size

1 - 2.5

Persistent Slabs

An icon showing Persistent Slabs

60-90 cm of snow sits above a crust/facet/surface hoar layer. Natural and human-triggered avalanches have been observed on this layer in the past week.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.



Expected Size

1.5 - 2.5

Valid until: Jan 25th, 2024 4:00PM