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Archived

Avalanche Forecast

Dec 3rd, 2024–Dec 4th, 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
1: Low
The avalanche danger rating at treeline will be low
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

Regions: Glacier.

An inversion in the region will bring warm temps to the Alpine. A blanket of valley cloud will give the appearance of a grey day, but the sun will be shining strong on Southerly aspects.

Warming temps may trigger loose, wet sluffs from steep S-facing terrain, as well as increase the reactivity of wind slabs.

Confidence

Moderate

Avalanche Summary

Sluffing in steep terrain has been reported by multiple parties in MIN reports over the past few days.

No new natural avalanche activity reported over the past 3 days.

Snowpack Summary

Surface hoar adorns the snowpack at Treeline elevations and up. Below this, 20-40cm of low density snow sits on various old surfaces, including: wind affect in exposed Alpine terrain; a crust on solar aspects; and settled storm snow in sheltered terrain.

The Nov 9 crust is down 50-100cm. The base of the snowpack is comprised of several dense, melt-freeze rain crusts formed in October.

Treeline snowpack depths average 110-130cm, falling to 45cm at Rogers Pass (1315m).

Weather Summary

An inversion brings WARM air aloft with valley cloud keeping it grey down below.

Tonight: Cloudy, Alp low 1°C, mod W winds, 1300m Freezing Level (FZL)

Wed: Sun and cloud, Alp high 2°C, light SW winds, 2000m FZL

Thurs: Sun and cloud, Alp high 1°C, light SW winds,1500m FZL.

Fri: Flurries, 10cm, Alp high -3°C, light SW winds,1500m FZL.

Terrain and Travel Advice

  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • Wind slabs are isolated, but may remain reactive.

Avalanche Problems

Loose Wet

Rapid warming in the Alpine, coupled with direct sun, may create a few days of loose/moist sluffs from steep solar aspects. This may be hard to identify with valley cloud blocking your view into the Alpine, but be aware that the sun is shining strong up high!

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wind Slabs

Pockets of stubborn wind slab can be found in wind-exposed Alpine terrain.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2