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Archived

Avalanche Forecast

Nov 21st, 2024–Nov 22nd, 2024
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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

Early season observations are limited. Make conservative terrain choices as you get familiar with the snowpack, practice your rescue skills, and get your winter legs under you.

Confidence

Low

Avalanche Summary

Reports of recent avalanches have been limited to a couple small, human triggered slabs on cutbanks.

On Friday, we expect that the wind will form fresh, human triggerable slabs at all elevations.

If you are getting out in the backcountry, consider making a post on the MIN (Mountain Information Network)

Snowpack Summary

Around 50 cm of recent snow is likely being redistributed by strong easterly winds from the alpine down to below treeline. Expect wind slabs at lower elevations than usual.

Below this, facets or surface hoar may overly a crust buried in early November.

At the north end of the forecast area, expect to find weak, sugary depth hoar close to the ground.

Treeline snowpack depths are expected to average around 100 cm.

In many places below treeline, ground roughness is still visible, and the snow depth is likely below the threshold for avalanches.

Weather Summary

Thursday Night

Partly cloudy with no new snow expected. 0-10 km/h southwest ridgetop wind. Treeline temperature -13 °C.

Friday

Mostly cloudy with no new snow expected. 40-80 km/h east wind at ridgetop and lower elevations. Treeline temperature -9 °C.

Saturday

Cloudy with 2 - 7 cm of snow expected. 40-70 km/h southeast wind at ridgetop and lower elevations. Treeline temperature - 17 °C.

Sunday

Mostly cloudy with 2-4 cm of snow expected. 25-50 km/h east wind at ridgetop and lower elevations. Treeline temperature -13 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Pay attention to the wind; once it starts to blow, sensitive wind slabs are likely to form.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Keep your guard up at all elevations. Wind slab formation has been extensive and could extend into openings below treeline.

Avalanche Problems

Wind Slabs

Expect to find human triggerable wind slabs, even at low elevations. They may be more reactive if they form on weak, sugary facets above a crust. Below treeline, there may not be enough snow to avalanche, but wind-loading could change that.

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2