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Avalanche Forecast

Archived

Nov 27th, 2020–Nov 28th, 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 possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
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.

Regions

Glacier.

Excellent riding conditions have been observed at and Below Tree Line in sheltered areas. There's also been isolated large avalanches running to Valley Bottom from very steep alpine terrain. Early season conditions still exist at lower elevations.

Weather Forecast

Today: 5cm of new snow, winds will be moderate gusting strong from the SW, and the FL could rise to HWY elevation.

Tonight: 10cm of new snow, Strong SW wind, FL lowering to 600m

Saturday: Storms waning, we could see cloudy with sunny periods.

Sunday: Mainly cloudy

Snowpack Summary

45cm of new snow fell over the last 3 days, followed by Strong Southerly winds. The storm snow fell on varying surfaces; it mainly fell on previous storm snow, it also buried Surface Hoar size 3 in isolated areas. A 10cm unreactive very soft slab was noted up Connaught yesterday, similar conditions were also noted in the Asulkan thanks to an MCR .

Avalanche Summary

A significant skier accidental size 2.5 was reported via a MIN yesterday, it occurred just outside of the Park in Quartz Ck, failing on SH with wide propagation. Another MIN from Avalanche Crest observed SH beneath the storm snow, failing on steep unsupported terrain features. We obs 6 new slides in the HWY corridor avg size 2, with a 1 size 3

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.