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Avalanche Forecast

Archived

Nov 18th, 2020–Nov 19th, 2020

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

Regions

Jasper.

Expect to find illegal snowmobile tracks in the Parkers Ridge Area. Windslab avalanches have been triggered recently by skiers. Please post to the MIN. https://www.avalanche.ca/mountain-information-network/

Weather Forecast

Overnight: Flurries. 8 cm. -9. Light W wind.

Thursday: Cloudy with sunny periods and isolated flurries. High -7. Wind W: 15 km/h gusting to 40 km/h.

Friday: Flurries. 7 cm. Low -13, High -9. Wind SW: 20 km/h gusting to 50 km/h.

Saturday: Cloudy with sunny periods and isolated flurries. Low -12, High -10. Wind W: 15 km/h gusting to 50 km/h.

Snowpack Summary

Yesterdays rain up to treeline have formed a new surface crust. Up to 15cm of new snow brings the snowpack to 45-75cm at treeline. The Nov. 4th rain crust exists up to 2600m depending on location in the forecast area, and is up to 50cm deep. SW winds have formed wind slabs in exposed terrain that have been reactive to skier traffic.

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 windslab in the alpine on a east aspect wind loaded feature. 

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.

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.