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Avalanche Forecast

Archived

Jan 26th, 2022–Jan 27th, 2022

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

Regions

Glacier.

Rising freezing level Thursday may weaken cornices and cause them to fail.

Watch for this overhead hazard and plan to travel early on exposed slopes.

Weather Forecast

This week a ridge of high pressure brings dry days, some valley cloud and seasonal temperatures.

Tonight: Cloudy with clear periods, Alp low -8*C, light NW winds

Thurs: Sun and cloud, Alp high -2*C, light SW ridgetop winds, fz lvl:1300m

Fri: Sun and cloud, Alp high -3*C, mod SW winds, fz lvl:1100 m

Sat: Sun and cloud, Alp high -4*C, mod SW winds

Snowpack Summary

Surface hoar rowing on surface, 5-8mm BTL, 2-4mm TL and above. Variable breakable surface crust exists on S-W aspects. Wind-affect can be found at treeline and above. The Jan 20 (2-4mm) surface hoar down 35cm, and Jan 11 (2-5mm) surface hoar down 70-90cm. The Dec 1 crust/facet combo is down ~1.5 - 2.5m and will require a big trigger to come alive.

Avalanche Summary

Observations from Jan 25th:

No new avalanches observed in the highway corridor nor in the Sir Donald/Avalanche Crest area.

A backcountry report of a natural cornice fall in the loop brook drainage triggering a size 3.0 avalanche.

A field team in the Sir D/Avalanche Crest zone ski-cut small features to 40* with no results.

Confidence

The weather pattern is stable

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.