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Avalanche Forecast

Archived

Nov 29th, 2020–Nov 30th, 2020

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 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.

Regions

Glacier.

Widespread wind affect has increased slab cohesion and reduced the travel quality at and above treeline. Expect all areas exposed to wind transport to have more reactive slabs

Weather Forecast

High pressure continues for today with clear skies, light SW wind and a high of -7. Trace snow will start tonight and continue through the day tomorrow with cloudy skies, a high of -6 and a brief W wind spike in the evening. Tuesday brings a significant high pressure ridge forecast to hold clear skies for the week

Snowpack Summary

60 cm of storm snow sits over old snow and the Nov 23 surface hoar size 3. The surface hoar has been observed, rounding, at treeline in isolated areas but not found in other profiles. The Nov 5 crust is now between 90 and 140cm down which is within the triggerable range for skiers and snowboarders in some areas.

Avalanche Summary

A skier triggered sz 2 from Overlook yesterday had very wide propagation. Numerous natural avalanches sz 1.5 to 2.5 on all aspects in the hwy corridor and Connaught creek yesterday as well 3x sz 3s including Cheops N 4. A skier triggered sz 1.5 in Avalanche Crest and a 2.5 in Quartz this week failed on SH with wide propagation.

Confidence

The weather pattern is stable

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.