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Avalanche Forecast

Archived

Apr 24th, 2021–Apr 25th, 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.

Be wary of solar aspects late in the day when crusts may begin to break down.

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

Weather Forecast

Sunday: Cloudy with sunny periods. Precipitation: Nil. Alpine temperature: High -3 °C. Ridge wind light to 25 km/h. Freezing level: 1800 metres. Monday: Sunny with cloudy periods. Precipitation: Nil. Alpine temperature: Low -6 °C, High -1 °C. Ridge wind west: 15-35 km/h. Freezing level: 2100 metres.

Snowpack Summary

Expect a trace on a supportive melt-freeze crust on all aspects and elevations except for most high Northerly where it may be dry and powdery. The mid-pack is thick and supportive. Weak faceted crystals linger at the bottom of the snowpack and remain a concern particularly in shallow snow-packs or northerly alpine aspects.

Avalanche Summary

No patrol occurred on Saturday and nothing new was reported. Avalanche activity has tapered off with good overnight freezing, cooler daytime temps and less solar input.

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.