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Avalanche Forecast

Archived

Feb 20th, 2018–Feb 21st, 2018

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

Banff Yoho Kootenay.

Despite the cold temps, be wary of solar aspects in the afternoon. There may be enough power in the sun to trigger some small avalanches out of steep terrain.

Weather Forecast

An arctic ridge over the area brings mostly clear, dry and cold conditions through the end of the week. There is a chance of light flurries along the divide but little accumulation is expected. Winds are forecasted to be light. A warming trend arrives towards the the weekend.

Snowpack Summary

The upper pack consists of storm snow from earlier in the month that is starting to settle and bond.  This overlies the mid-pack where there are three weak layers that are gaining strength but continue to produce moderate, sudden planar test results on surface hoar.

Avalanche Summary

No new avalanches were reported or observed in the past 48 hours.

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.