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Avalanche Forecast

Archived

Feb 3rd, 2021–Feb 4th, 2021

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.

Up to 60cm of new storm snow distributed through the forecast region.

Look carefully for signs of localized instability and wind effect before committing to big features.

Weather Forecast

Tonight: Cloudy with clear periods, isolated flurries and a trace of new snow. Temp: -15 C. Ridge wind W: 15 km/h.

Thursday: Cloudy with flurries. Accumulation: 4 cm. Temp: High -9 C. Ridge wind west: 15-35 km/h.

Friday: A mix of sun and cloud with isolated flurries. Temp: Low -23 C, High -10 C. Ridge wind northwest: 15 km/h gusting to 50 km/h

Snowpack Summary

40-60cm of new storm snow appears to be bonding well to the old surface, on a mixed form/facet interface giving hard, sudden planar results in field tests at the Icefields. Soft-slab will continue to develop on all aspects and elevations as the snow settles. Mid-pack remains strong underfoot except in areas where the snowpack is less than 100cm.

Avalanche Summary

A determined avalanche control team worked hard Tuesday to produced a few good results, up to size 2.5 on a very stubborn storm interface in low elevation targets with several large triggers. A natural avalanche cycle continues with observed loose dry and soft slabs to sz 1.5 on many aspects.

Share your trip info at Mountain Information Network .

Confidence

Wind effect is extremely variable

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.