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Avalanche Forecast

Archived

Feb 24th, 2021–Feb 25th, 2021

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

Regions

Little Yoho.

Avalanche control continues to produce large avalanches and with more wind coming on Wednesday night, keep your terrain selection conservative. Good results from control work above the Mt. Dennis ice climbs and Field Back Road.

Weather Forecast

The snow and wind will start again overnight on Wednesday, with forecasts indicating up to 100 km/hr from the SW and 5-10 cm of snow through the day. Looks like the next ten days will be a continuous flurries; never more than a few cm per day but continuing daily for at least a week.

Snowpack Summary

The last storm stared with extreme winds then deposited 50cm of snow creating a widespread avalanche cycle failing mainly below this storm snow. Indications are that the surface snow needs some wind in order to stiffen the slab, otherwise it won't propagate. Settlement will be slow over the next few days and this slab will release with triggers.

Avalanche Summary

We are past the peak of the avalanche cycle and naturally released avalanches were not observed on Wednesday. However, explosive triggers continue to easily release large avalanches running to the bottom of their paths. This includes large avalanches on Mt Field and Mt Dennis. Results in the Simpson area were limited due to less wind in the area.

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.