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Avalanche Forecast

Archived

Dec 16th, 2020–Dec 17th, 2020

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

Regions

Glacier.

All Winter Restricted Areas are CLOSED today!

Some avalanche paths ran full path last night and early this morning, stopping at valley bottom.

Weather Forecast

We're in store for an active weather week, with a series of fast moving storms set to move across BC.!

Today: 5-10cm new snow, mod-gusting strong wind from the SW, FL 900m

Tonight: 5-10cm new snow, strong wind from the SW, FL 800m

Thursday: 5cm new snow, moderate-gusting strong wind from the SW, FL 1000m

Snowpack Summary

Another 22cm of new snow brings our storm total to ~40cm in the last 48 hours. Strong winds from the Sth and mild temperatures have formed storm slabs at all elevations. Storm slabs have buried another Surface Hoar Layer (Dec 13th). The lower and mid snowpack is relatively strong, with the Nov 5th currently unreactive to stability tests or skiers.

Avalanche Summary

AVALANCHE ACTIVITY WILL ESCELATE TODAY! Several skier controlled very soft slab avalanches were reported from Mcgill Shoulder area yesterday. Small loose dry and slab avalanches were also reported yesterday on Avalanche Crest in a MIN report. Numerous avalanches have been detected or observed in the HWY corridor up to size 3 in the last 24 hours.

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.

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.

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.