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Archived

Avalanche Forecast

Nov 29th, 2024–Nov 30th, 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: Bull, Crowsnest North, East Purcell, Elkford East, Elkford West, Purcells, South Rockies.

Weak layers in the snowpack warrant careful terrain choices and watching for signs of instability like cracking or whumpfing.

Confidence

Low

Avalanche Summary

Since the weekend, 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

Friday Night

Mostly cloudy. 35 km/h west ridgetop wind. Treeline temperature -10 °C.

Saturday

Mix of sun and cloud with 1 to 2 cm of snow in the Purcells. 35 km/h west ridgetop wind. Treeline temperature -8 °C.

Sunday

Mostly cloudy with 1 to 3 cm of snow in the Purcells. 20 km/h west ridgetop wind. Treeline temperature -6 °C.

Monday

Sunny. 15 km/h southwest ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • 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.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.

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: Unlikely - Possible

Expected Size: 1 - 1.5