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Avalanche Forecast

Archived

Nov 26th, 2020–Nov 27th, 2020

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

Regions

Jasper.

Additional snow and relentless winds will keep the hazard elevated in the alpine and Upper Treeline until we see both relax. Great skiing can be found in sheltered locations. Continue to submit to the MIN if and when you can.

Weather Forecast

Thursday evening and in to friday we can expect to see overcast skies and about 10cm of snow with winds up to 40km/h from the SW. Alpine temperatures well remain seasonably warm around -8.

Saturday will see an additional 5cm with cooling temperatures -13 with appearances from the sun

Snowpack Summary

The snowpack is highly variable depending on location. Height of snow at Parkers is ~100cm at treeline. The Nov.4 crust found up to 2600m, and is ~70cm deep. Test results today showed hard results CTH23 failing on the basal weakness. Continued wind slab developing on N and E aspects ridge top down into treeline. Basal layers continue to weaken.

Avalanche Summary

A field team was in the Hilda peak area today and noted 1 loose dry avalanche from steep N facing alpine terrain and 1 Na Sz1.5 wind slab in the boundary slide paths. good visibility throughout the day.

Confidence

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.

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.