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Avalanche Forecast

Archived

Nov 19th, 2020–Nov 20th, 2020

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.

Skiing, ice climbing and avalanche season is upon us. Please report conditions to the MIN. https://www.avalanche.ca/mountain-information-network/

Weather Forecast

Parkers Weather Forecast

Overnight: Cloudy with clear periods and isolated flurries. Low -13. Wind light SW.

Friday: Cloudy with sunny periods and isolated flurries. High -12. Wind light SW.

Saturday: Cloudy with sunny periods. Low -13 C, High -10 C. Wind light SW

Snowpack Summary

Up to 20cm of new snow in the past 24 hours. This overlies a new rain crust from Nov 17. The snowpack is 55-85cm at treeline. The Nov. 4th rain crust exists up to 2600m depending on location, and is up to 50cm deep. Now buried, wind slabs in exposed terrain that sit on the Nov 4th crust recently continue to be reactive to large loads.

Avalanche Summary

On Monday a size 2 skier triggered wind slab avalanche above the Hilda Hostel at Parker Ridge failed down 70cm sending blocks of concrete like snow into the trees. Recent report of a size 2 skier triggered wind slab in the alpine on a east aspect wind loaded feature.

Confidence

Due to the number and quality 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.

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.

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.