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Avalanche Forecast

Archived

Nov 29th, 2019–Nov 30th, 2019

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

Regions

Glacier.

Enjoy the cold clear weather and be back to the trailhead early on these short days.

Weather Forecast

Cold and dry conditions today with an alpine high of -8C and light easterly ridge crest winds. Freezing levels will remain well below valley bottom. Into the weekend the forecast calls for more cold and dry for Saturday and a warming trend beginning on Sunday as the arctic ridge starts to break down.

Snowpack Summary

Strong Northerly winds have redistribute last weekend's storm snow on alpine and treeline lee features, caution, reverse loading. Cold temperatures should soften former surface slabs in protected areas. The 2 main layers to watch for are the Nov 23rd Surface Hoar, buried 30-50-cm, and the Nov 17th interface.

Avalanche Summary

One size 2.5 slab avalanche came out of MacDonald Gulley 2 yesterday running half way down the runout zone. No new avalanches reported in the backcountry.

Confidence

Due to the number of field observations

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.