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Avalanche Forecast

Archived

Apr 25th, 2021–Apr 26th, 2021

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Jasper.

Daytime freezing level and solar input increasing - set the alarm for an early launch and plan to limit exposure in the afternoon.

Click the "More Spring Conditions details" link below for more info on the varying spring condition scenarios.

Weather Forecast

Monday: Sunny with cloudy periods. Precipitation: Nil. Alpine temperature: Low -9 C, High -1 C. Ridge wind west: 15-35 km/h. Freezing level: 2200 metres.

Tuesday: Cloudy with sunny periods.  Precipitation: Nil. Alpine temperature: Low -5 C, High -3 C. Ridge wind southwest: 15-35 km/h. Freezing level: 2000 metres.

Snowpack Summary

Supportive melt-freeze crust on all aspects and elevations; northerly aspects above treeline may still hold dry snow. The mid-pack is thick and supportive. Weak faceted crystals linger at the bottom of the snowpack and remain a concern particularly in shallow areas and northerly alpine aspects.

Avalanche Summary

Patrol on Sunday - no new avalanche activity noted.  Daytime freezing level rising this week with an increase in solar input - expect an increase in avalanche activity late afternoons in the coming days.

Confidence

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.

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.