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Archived

Avalanche Forecast

Apr 13th, 2025–Apr 14th, 2025
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: Glacier.

North-facing slopes in the alpine hold the best ski quality. They also have a buried layer of surface hoar that has been surprising riders this past week.

Carefully assess your line for this weak layer before committing.

Confidence

Moderate

Avalanche Summary

One natural glide slab was observed on the 12th. Otherwise, no new natural activity reported since the 10th

On Friday there was a backcountry report of skier triggered sz 2 wind slab on the Dome glacier at 2450 m on a NE asp. This avalanche likely failed on a layer of surface hoar down 15-40 cm

Check out this MIN from Friday for another skier accidental, sz 2.5 with involvement on this interface. Dig down and have a look for this layer before jumping into large or committing features

Snowpack Summary

Daily melt/freeze cycles are affecting the surface of the snowpack on solar slopes and all aspects BTL, with several crusts of variable strength in the upper snowpack. High alpine, north facing slopes still hold dry snow. A buried surface hoar layer exists down 15-40cm in sheltered north alpine areas above ~2300m. This layer is reactive to human triggering and is catching people off guard.

Below treeline, conditions are variable and challenging travel exists.

Weather Summary

Variable convective spring weather continues. A ridge builds Monday, but is quickly pushed aside by a small disturbance Tuesday

Tonight Clear periods. Alp low -3°C. Ridge wind W 15-35km/h. Freezing Level (FZL) 1400m

Mon Mix sun & cloud. Alp high 3°C. Wind SW 20-30km/h. FZL 2500m

Tues Mix sun & cloud, possible flurries. Alp high 1°C. Wind W 20-30km/h. FZL 2100m

Wed Mix sun & cloud. Alp high -2°C. Wind NW 15-30. FZL 1800m

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be aware of the potential for larger than expected storm slabs due to buried surface hoar.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

Avalanche Problems

Wind Slabs

Strong winds Thursday/ Friday formed wind slabs on lee slopes in the alpine. This layer is sitting on a crust and it's able to pick up mass in steep terrain. On high alpine North facing slopes, this wind slab sits on a layer of surface hoar and is producing skier triggered size 2-2.5 avalanches!

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5

Loose Wet

Intense spring sun will weaken the upper snowpack, especially on steep solar slopes. Rider triggering is also possible. Use caution in steep terrain and around terrain traps.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2