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Avalanche Forecast

Archived

Mar 5th, 2022–Mar 6th, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Strong solar radiation Sunday, could produce increased avalanche activity on southerly aspects.

Weather Forecast

Clear weather Sunday will continue to produce strong solar outputs on southerly aspects. Freezing levels will remain near valley bottom. Increase cloud cover Monday will bring a trace a precipe and moderate to strong ridge top winds.

Snowpack Summary

5-15cm of new snow overlies a melt freeze crust from Thursdays warming, this crust can be found up to 1900m. Above 1900m, 40 cm of previous storm snow has solidified into a slab overlying the February 16 sun crust on steep southerly aspects. This combination should now be watched closely, as it produces whumphs and tests indicate propagation.

Avalanche Summary

Increased solar outputs Saturday initiated isolated loose dry activity out of extreme terrain. Evidence of recent avalanche activity on the Feb 16 persistent weak layer was observed on steep southerly aspects at treeline, producing avalanches to size 1.5.

Confidence

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.