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Avalanche Forecast

Archived

Nov 24th, 2019–Nov 25th, 2019

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

Regions

Glacier.

As natural activity tappers later today, human triggering will remain very likely.

The new Winter Permit System is in effect.

A permit is required to enter restricted areas when they are open.

Weather Forecast

Ongoing strong winds and flurries in the wake of the frontal system that passed to our north last night.

Today: Flurries (2-3cm). Treeline High -8 C. Ridge wind light W (gusting strong). Frzlvl 1000m.

Tonight: Isolated flurries. TL Low -10 C. Wind mod SW. Frzlvl 600m.

Monday: Cloudy with sunny periods. TL High -10 C. Wind light NW. Frzlvl 700m.

Snowpack Summary

Up to 35cm of new snow and mod-strong southerly winds continues to build fresh storm slabs, these overly a suncrust on steep solar aspects into the alpine (widespread below 1600m), and up to 10mm surface hoar below treeline. The new snow may also trigger the persistent slab (now buried down 60-90cm) that sits on a crust/surface hoar/stellar layer.

Avalanche Summary

A natural cycle of large avalanches is underway. Do not let the thin snow cover in valley bottoms fool you in to being complacent about overhead hazard - large avalanches have the potential to reach valley bottom.

Confidence

Due to the number and quality 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.

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.