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Archived

Avalanche Forecast

Apr 19th, 2022–Apr 20th, 2022
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
1: Low
The avalanche danger rating in the alpine will be low
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.

A fresh dusting in the hills has dressed them up. Wind slabs, fragile cornices, and daytime warming are the biggest concerns, but don't forget about the widening glide cracks!

The weekend warming trend may finally usher in true Spring conditions.

Weather Forecast

Cool mornings with freezing levels (FZL) peaking during mid-afternoon periods, the usual diurnal cycle.

Tonight: Cloudy with clear periods, FZL 700m, light to gusty mod S winds

Wed: Sun and cloud, Alp high -4*C, FZL 1800m, light S winds

Thurs: Sun, cloud, and isolated flurries, trace amounts, Alp high -1*C, FZL 2100m, light S winds

Snowpack Summary

Approx 20cm of new snow and strong, gusty SW winds at Treeline have buried a supportive crust (5-20cm thick, up to ~2200m) or variable soft to hard wind slab in the Alpine. Fresh wind slabs likely in lee areas Treeline and above. Expect warmish "dust on crust" as you ascend up valley, bring your glide wax!

Avalanche Summary

Natural activity has been minimal this past week, but likely to pick up with the new snow and winds.

Last week there was a sz 3 skier triggered (on belay) cornice fall off of Mt Bonney, as well as a close call when a small wind slab nearly took a skier into a crevasse!

Confidence

Avalanche Problems

Wind Slabs

New snow and gusty winds at ridge-top will have created reactive wind slabs in immediate Alpine and upper Treeline lee features.

  • Use caution in lee areas in the alpine and treeline. New snow and wind has formed wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices are LARGE and may be sensitive to temperature fluctuations, solar radiation, wind loading or just your mere presence nearby. Take necessary precautions if approaching them to access your line and limit your exposure below them.

  • Minimize exposure to cornices. They will squish you.
  • Give cornices a wide berth when traveling on ridges.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 3