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Avalanche Forecast

Archived

Nov 25th, 2019–Nov 26th, 2019

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 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.

Regions

Glacier.

Reactive storms slabs have the potential to reach shrubby valley bottoms. Stay vigilant in your situational awareness!

The Winter Permit System is now in effect.

Weather Forecast

A NW flow is bringing cooling temperatures and a break in precipitation. Below seasonal temperatures and clear skies will arrive by mid-week.

Today: Isolated flurries with sunny breaks. Freezing level 700m. Winds light from the west.

Tomorrow: Mix of sun and cloud with isolated flurries. Freezing level 400m. Winds light from the NE

Snowpack Summary

The weekend's 40cm of storm snow was accompanied by mod-strong S'ly winds, which have built fresh storm slabs. These slabs overlay either 5-10mm surface hoar at treeline and below, or a crust, which is widespread below 1600m and on steep solar aspects. Persistent slabs exist down 60-90 cm and may be triggered by larger loads.

Avalanche Summary

Yesterday, a natural avalanche cycle occurred in steep, north facing paths to size 3.0. These avalanches traveled through brush-filled terrain below treeline, into valley bottoms. Although the natural avalanche cycle has tapered off, expect human triggering to remain likely in wind affected areas in the alpine and at treeline.

Confidence

Due to the number of field observations

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.