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Avalanche Forecast

Archived

Mar 9th, 2021–Mar 10th, 2021

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Banff Yoho Kootenay.

Conditions are improving. It is the time of year to start early and finish early. Avoid exposure to slopes with large triggers such as cornices. 

Weather Forecast

Cool seasonal temps, cloud cover and about 3cm of snow are expected Wednesday. Winds will drop to light by late morning Wednesday. Benign weather with little in the way of warming is expected Thursday and Friday.

Snowpack Summary

Since Friday, up to 30 cm of recent snow sits over solar crusts and wind effect in open areas. New solar crusts on low elevation steep slopes formed on Tuesday. 2 persistent facet layers (Feb 19 & Jan 27) are down 30-80cm and still producing sudden shears in some locations. In thin areas the basal depth hoar/crust from Nov is still quite prominent.

Avalanche Summary

Sunshine Patrol reported observing a size 2 persistent slab on Fatigue mountain on a North facing hanging slope under a cornice. Otherwise no avalanches were observed or reported.

Confidence

The weather pattern is stable on Wednesday

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.