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Avalanche Forecast

Archived

Dec 3rd, 2020–Dec 4th, 2020

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

Regions

Glacier.

Natural activity has slowed since yesterdays temperature spike. Forecast freezing levels are lower today

Weather Forecast

A sunny start today above the valley cloud. Temperatures are inverted and above freezing already today in the alpine. Clouds moving in with cooling temps in the afternoon and tomorrow. A slight shift to mod SW wind and clear skies on Saturday with another rise in temperatures, freezing level over 3000m

Snowpack Summary

A surface crust formed at treeline and above overnight on solar aspects. Where sheltered surface hoar has formed to sz 3. Widespread surface hoar 5-10mm is dn 10cm over old windslabs in the alpine and exposed areas of treeline. In sheltered areas around TL there is another buried layer of surface hoar dn 40-60-cm. Nov 5th Cr is down over 1m

Avalanche Summary

Daytime warming and sun yesterday triggered numerous natural loose and slab avalanches around midday on solar aspects to sz 2.5 with a sz 3 in Mannix.

Confidence

Freezing levels are uncertain on Thursday

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.