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Avalanche Forecast

Archived

Nov 17th, 2020–Nov 18th, 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.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

If it's not a new breakable crust, watch out for fresh wind slabs.

Weather Forecast

Tonight: 8 cm of snow. Alpine temperature: Low -3 °C. Wind: 20 km/h gusting to 55 km/h. Freezing level 1700 metres

Wednesday: 15cm of snow. Alpine temperature: Low -6 C High -3 C. Wind SW 15 km/h gusting to 55 km/h. Freezing level 1600m

Thursday: 7cm of Snow. Alpine temperature: Low -13 C High -5 C. Wind SW 10-30 km/h. Freezing level at valley bottom

Snowpack Summary

Warm temps and rain up to treeline have formed a new surface crust. Up to 10cm of new snow brings Treeline snowpack to 45-75cm with overall supportive travel. The Nov. 4th rain crust exists up to 2600m depending on location in the forecast area, and is about 30cm deep. SW winds have formed wind slabs in the alpine and at treeline.

Avalanche Summary

A few Loose Dry avalanches in steep terrain were observed from the road today up to size 1.5.

On Sunday 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.

Confidence

Intensity of incoming weather systems is uncertain

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.