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Avalanche Forecast

Archived

Jan 4th, 2021–Jan 5th, 2021

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

Look for sheltered terrain for the best skiing and avoid thin to thick areas in the alpine.

Weather Forecast

Wednesday: Flurries. Accumulation: 6 cm. Alpine temperature: Low -10 C, High -8 C. Ridge wind southwest: 15-25 km/h.

Thursday: A mix of sun and cloud. Precipitation: Nil. Alpine temperature: Low -11 C, High -7 C. Ridge wind light to 15 km/h.

Snowpack Summary

45cm of new snow further buries the mid-December persistent layers, (surface hoar and facet combo) down 40-70cm. The mid-pack is supportive where snow is deeper than 60cm. The bottom of the snowpack consists of facets and depth hoar.

Avalanche Summary

During the storm on Jan 3. serval large natural avalanches were observed in the alpine on all aspects. Avalanche control had varied results from no results to several size 3 wind slabs stepping down to deep weakness on all aspects in the alpine.

Make your field trip observations count! Mountain Information Network.

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.

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.

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.