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Avalanche Forecast

Archived

Mar 9th, 2020–Mar 10th, 2020

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

Regions

Glacier.

Happy Daylight Savings!

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

We are into a period of lower probability/ high consequence!

Weather Forecast

A cold front is moving southward across the province and will reach Rogers Pass by Tuesday morning.

Today: a mix of sun and cloud. Light west winds. Alpine high -11*C.

Tonight: cloudy with clear periods, no precipitation. Moderate SW winds. Alpine low -11*C

Tomorrow: 19cm of snow with moderate SW winds. Alpine high -8*C and freezing level at 900m.

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 60-90cm, 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

Numerous loose dry avalanches up to size 2.0 were observed yesterday on steep solar aspects, as well as several size 2.5 avalanches from the gullies of Mt. Macdonald.

On Friday, a snowmobile triggered size 2.5 slide occurred inside the E boundary of Glacier NP in the Bald Hills. Evidence indicated 2 sleds were involved and the group self extricated.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.

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.

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.