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Avalanche Forecast

Archived

Feb 1st, 2022–Feb 2nd, 2022

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

Regions

Jasper.

Despite a moderating hazard, there is sufficient complexity in the snowpack to question your exposure on any slope. Don't let your guard down!

Weather Forecast

Wednesday: Cloudy with sunny periods and isolated flurries. Temp: High -20 °C. Wind SW: 15 km/h.

Thursday: Cloudy with sunny periods and isolated flurries. Temp: Low -20 °C, High -12 °C. Wind W: 15 km/h.

Friday: Flurries. Accumulation: 7 cm. Temp: Low -13 °C, High -9 °C. Wind SW: 25 km/h gusting to 60 km/h.

Snowpack Summary

New snow with N winds (-24hr) building slabs in alpine and tree line lee features. Varied wind effect at all elevations. A facetted and complex snowpack is wide-spread throughout tenure. Buried surface hoar found in isolated places, TL and below with no cohesive slab over top. Convective upslope storm isolated to the Maligne Range with 35cm of HN.

Avalanche Summary

Storm slabs and considerable loose dry activity observed near Medicine Lake on a West aspect at tree line. These storm slabs may have failed on preserved surface hoar but the overlying slab is not very cohesive, yet!

No new avalanche activity observed on the Icefields Parkway Jan 31.

Confidence

Problems

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.

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.