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Avalanche Forecast

Archived

Mar 14th, 2020–Mar 15th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Fresh windslabs from strong outflow winds will be possible for skiers and boarders to trigger today.

The windchill is real in any exposed areas, dress/pack accordingly.

Weather Forecast

An arctic high pressure is moving in, giving clearing skies and cold temps through the weekend. The daily high temperature at Treeline will be -19 on Saturday, dropping to -21 overnight, and back up to -7 on Sunday. Outflow (North-Easterly) winds are currently strong through out he park, but are forecast to abate once the Artic settles in.

Snowpack Summary

Strong NE winds are building fresh windslabs in unusual places. The Mar. 10th interface of suncrust on all solar aspects and possibly small surface hoar on shaded slopes, is now buried down 20-40cms. The Feb 22 persistent weak layer is down 90-130cm and consists of 3-7mm surface hoar on all aspects up to 2450m as well as a crust on solar aspects.

Avalanche Summary

No new avalanches have been reported in park in the past couple of days.  Isolated instances of skiers triggering the February 22nd weak layer continue to occur in neighboring areas.

Confidence

Wind speed and direction is uncertain

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.