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Avalanche Forecast

Archived

Apr 21st, 2022–Apr 22nd, 2022

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Small reactive wind slabs can be found at treeline and above.

Convective flurries could bring locally heavy snowfall Friday combined with rising freezing levels. The hazard may rise in isolated locations associated with the increased snowfall amounts.

Weather Forecast

Unsettled weather can be expected Thursday evening with convective flurries into the day Friday. Expect freezing levels to just reach 1500m overnight before a rise to around 2000m Friday. Winds variable and light. Snowfall amounts look to range from 5-10 cm although the convective nature of this weather may bring much more in isolated locations

Snowpack Summary

10-20 cm of snow fell on April 19/20 with significant wind to form slabs at treeline and above. This snow sits on thin suncrusts to 2500m and as much as 20cm of snow ( which tapers with elevation and is wind affected in the alpine) over the April 8 crusts which are found everywhere but above 2500m on N aspects. Expect a new sun crust Friday.

Avalanche Summary

A road patrol to 93S today found the limited natural cycle following the April 19 storm to be ongoing today with solar triggering of small windslabs at treeline. Since the snow arrived the ski hills have worked with small reactive slabs and it appears skiers triggered a few small slabs on the east face of Mt Whymper either today or yesterday.

Confidence

Intensity of incoming weather systems is uncertain on Friday

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.