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Archived

Avalanche Forecast

Dec 21st, 2024–Dec 22nd, 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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Watch for fresh wind slabs on steep slopes in the alpine and at treeline.

The best riding will be in sheltered spots.

Confidence

Moderate

Avalanche Summary

On Friday, several natural storm slabs were reported on north and west aspects in the alpine and at treeline.

On Wednesday, a small 20 cm deep slab was triggered by a snowmobile south of Valemount. It failed on surface hoar from mid-December that was preserved on a northwest aspect in the alpine.

Snowpack Summary

30 to 50 cm of snow has fallen this week. At upper elevations, southwesterly wind has redistributed snow to lee features.

A surface hoar layer is now buried 40 to 70 cm down. This layer is spotty and hard to find. It is mostly not triggerable, but in very sheltered treeline and alpine features, it may be possible. Where there isn't surface hoar, there is likely a crust.

Weather Summary

Saturday Night

Cloudy with up to 5 cm of snow. 15 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m.

Sunday

Mostly cloudy. 30 to 40 km/h south ridgetop wind. Treeline temperature -5 °C.

Monday

A mix of sun and cloud with up to 5 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Tuesday

Mostly cloudy. 30 to 40 km/h south ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • The best and safest riding will be on slopes that have soft snow without any slab properties.

Avalanche Problems

Wind Slabs

Investigate for wind-loaded pockets, especially around ridges and open bowls.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2