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Avalanche Forecast

Archived

Apr 20th, 2022–Apr 21st, 2022

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

Regions

Jasper.

Ski quality is pretty good and there has been less wind slab development then previously forecast.

Most areas in the alpine are stable but the definition of Moderate fits with pockets of wind slab still possible in specific terrain features up high.

Weather Forecast

Parkers Ridge area:

Thursday- Cloudy with sunny periods & isolated flurries. Trace precipitation. West wind 10km/h. Freezing level 2100m

Friday- Cloudy with sunny periods & isolated flurries. Trace precipitation. Light-20 km/h Wind. Freezing level 2200m

Sat- Flurries. 3-6cm precipitation. Freezing level 2300m.

Additional info @ Avalanche Canada MWF

Snowpack Summary

5-15cm of recent storm snow sits over previously wind effected surface or sun/temperature crusts. Less winds slab development then anticipated with most areas having no visual wind effect. Isolated pockets of wind slab possible near ridge top. A variety of crusts are present in upper snowpack at all elevations but mid snowpack is well consolidated

Avalanche Summary

Sz 1 loose dry avalanche activity observed on the Icefields Parkway today from steep unsupported terrain with limited visibility. Medicine Slabs on Maligne Lake Road had one Size 1.5 natural wind slab avalanche 20cm deep and a few loose dry avalanches.  Please consider submitting a MIN report if you observe any new activity.

Confidence

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.