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Avalanche Forecast

Archived

Feb 25th, 2021–Feb 26th, 2021

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

Regions

Jasper.

Be cautious in wind effected terrain, which is wide-spread across the region.

Solar and wind have prompted rapid changes in the surface condition and localized areas of instability. Dig to assess. Be attentive to changes. Wear sunscreen. Call your Mom

Weather Forecast

Instability will continue to produce scattered flurries and varied sun throughout the Rockies for the weekend. General snowfall accumulations between 5-10cm along and west of Highway 93N, with moderate to strong (in the Alpine) westerly winds through to Sunday. 

Snowpack Summary

Varied depth wind slabs or hard surface conditions in Alp & TL. Slabs overlie a facet interface down as much as 20 to 40cm, with varied and questionable bonding strength. Sheltered areas, top 30-60cm is faceted snow over a mostly supportive mid-pack. Reminder to be cautious of thick to thin characteristics, especially on a the surface slab. 

Avalanche Summary

Forecasters on 93N noted wide spread wind effect in all alpine and exposed tree line features with strong to extreme snow transport continuing at ridge top.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.