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Avalanche Forecast

Dec 1st, 2024–Dec 2nd, 2024
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Akamina, Bull, Crowsnest North, Crowsnest South, East Purcell, Elkford East, Elkford West, Purcells, South Rockies.

Avoid steep, wind-loaded slopes as this is where you're most likely to trigger an avalanche.

Field data is limited; We'd love to see your MIN reports if you are out in the mountains!

Confidence

Low

Avalanche Summary

In the past week, several size 1 to 1.5 deep persistent slab avalanches have been reported in the Invermere area. These 40 cm thick slabs are failing on weak basal snow and have been triggered by both riders and explosives.

No wind slab avalanches have been reported, though wind transport has been observed.

Snowpack Summary

Treeline snow depths are 50 to 70 cm, with deeper wind-loaded pockets in the alpine. Surface snow is being redistributed by wind in exposed areas but remains soft in sheltered terrain.

In the Invermere area, weak faceted snow at the base of the snowpack has caused several small but notable deep persistent slab avalanches. Similar conditions are likely in the South Rockies, though observations are limited.

Weather Summary

Sunday Night

Mainly clear. 10 to 30 km/h southwest ridge top wind. Treeline temperature -2 °C, with an above-freezing layer developing between 2300 m to 3000 m.

Monday

Mainly clear. 20 to 40 km/h southwest ridge top winds. Treeline temperature -2 °C.

Tuesday

A mix of sun and cloud. 20 to 40 km/h southwest ridge top wind. Treeline temperature -1 °C.

Wednesday

A mix of sun and cloud. 15 to 40 km/h southwest ridge top wind. Treeline temperature -1 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be mindful that deep instabilities are still present in the snowpack.
  • Avoid steep terrain, including convex rolls, or areas with a thin, rocky, or variable snowpack.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.

Avalanche Problems

Deep Persistent Slabs

Avalanches on weak faceted snow at the base of the snowpack are possible on steep smooth slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Wind Slabs

Wind from the west may have formed wind slabs along ridgelines and in exposed terrain.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5