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Avalanche Forecast

Archived

Apr 9th, 2022–Apr 10th, 2022

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

Regions

Banff Yoho Kootenay.

Be on the lookout for new windslabs following Friday's storm. 

While it may feel like spring at the lowest elevations, the alpine sure feels a lot like winter...  We expect an "Cold and Snowy scenario" into the start of the week at least.

Weather Forecast

Recovery from Friday's warming should continue overnight into Sunday as treeline temperatures drop as low as -18C. 5cm of snow is expected as unstable weather passes through the region and treeline temperatures climb to a peak of -5C. Winds out of the north peak late in the day around 30km/h. Cooler still for Monday and Tuesday...

Snowpack Summary

Up to 20 cm of new snow fell with Friday's storm as temperatures dropped after a significant warm up. A thin surface crust over an isothermal snowpack was found at low elevations Saturday as temperatures cool. 10-30 cm of soft, dry snow sits on a firm crust on N aspects. On solar aspects a series of crusts exist in the snowpack at all elevations.

Avalanche Summary

The ski hills both reported working with reactive, soft new windslabs 5-20cm thick. Lake Louise found these isolated to the alpine immediate lees while Sunshine reported wide propagations found slabs into treeline as well.

Confidence

Due to the number of field observations

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.