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Avalanche Forecast

Archived

Dec 2nd, 2020–Dec 3rd, 2020

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

Glacier.

Expect Natural Avalanches this afternoon as temperatures heat up in the alpine!

Weather Forecast

A strong High-Pressure system from the south of the border will produce an inversion with; unseasonably warm temperatures in the Alpine, sunny skies, light wind. Freezing level could reach 3500m today, dropping to HWY elevation overnight. Tomorrow the inversion will hopefully subside a little with the FL only forecast to reach 1800m.

Snowpack Summary

5-10cm of new snow, and moderate wind has hidden a widespread layer of surface hoar size 5-10mm in sheltered areas. Beneath this interface are old wind slabs in the Alpine and exposed areas of treeline. In sheltered areas around TL there is another buried layer of SH dwn 40-60-cm. The Nov 5th Cr is now buried over 1m down

Avalanche Summary

A few loose dry avalanches were obs in the Park yesterday. They occurred on solar aspects, starting from steep unsupported, rocky terrain features. A size 2.5 wind slab, and a cornice fall were also noted, that probably failed Monday evening with the strong winds. Big lines have been ridden recently, with little avalanche activity observed.

Confidence

Intensity of incoming weather systems is uncertain

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.