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Avalanche Forecast

Archived

Mar 8th, 2020–Mar 9th, 2020

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

Regions

Glacier.

Happy Daylight Savings!

Give your minds extra time to assess slopes for the Feb 22nd weak layer.

We are moving into a lower probability/ high consequence hazard window. 

Weather Forecast

A brief ridge of high pressure sets up today before a stronger frontal system arrives tuesday.

Today: mix of sun and cloud and no precip. Winds light from the west. Alpine high -11C

Tonight: cloudy with clear periods and no precip. Light west winds. Alpine low -13C

Tomorrow: mix of sun and cloud, no precip. Moderate SW winds. Alpine high -11C

Snowpack Summary

25cm+/- of storm snow has been redistributed by moderate S'ly winds near ridgecrests in the alpine and exposed treeline. Below these slabs, the Feb 22nd persistent weak layer is now buried down 50-80cm, and consists of 3-7mm surface hoar on all aspects up to 2450m, and a crust on solar aspects. In some locations, this surface hoar sits on a crust.

Avalanche Summary

Two large (2-2.5) avalanches occurred in the East highway corridor yesterday.

On Friday, Glacier National Park VS staff responded to a InReach call for a snowmobile triggered size 2.5 slide that occurred inside the E boundary of Glacier National Park in the Bald Hills. Evidence indicated 2 sleds were involved and the group self extricated.

Confidence

Due to the number and quality of field observations

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.