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Avalanche Forecast

Archived

Feb 10th, 2023–Feb 12th, 2023

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

Regions

.

A problem related to a persistent slab problem is to be considered if you go into forest corridors with ice falls.

Confidence

Moderate

Avalanche Summary

A size 1 persistent slab avalanche was triggered Thursday in a forest corridor at the base of an icefall. To see the report.

More and more relevant information is shared by users with the Mountain Information Network. Thank you for contributing to the collection of this valuable data! You can also continue to write to us at [email protected].

Snowpack Summary

Around 25 cm of powdery snow lies on the surface in non-skied areas except on slopes exposed to west winds. Lower down, harder layers cover flat-faced crystals just above the January 18 icy crust. This brittle interface can be unstable, especially in the upper part of the couloirs with ice cascades.

Snow depths range from 70 to 120 cm in general.

Weather Summary

Friday evening and night: Blowing snow. 5 cm of snow. Wind northeast 20 to 35 km/h. Low -9 C.

Saturday: Cloudy. 2 cm of snow in the morning. Clearing in the afternoon. Wind northwest 25 to 35 km/h. High -11 C.

Sunday: A few flurries (1 cm). Wind west 40 to 70 km/h. High -5 C.

Problems

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.

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.