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Avalanche Forecast

Archived

Feb 7th, 2021–Feb 8th, 2021

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.

Winds have begun to shift north in some locations in the park- keep an eye for reverse loading today.

Weather Forecast

Arctic air is on the way! Temps dipping to -30 C by Wednesday....

Today: A mix of sun and cloud. No precip. Alpine high -17 C. Light NW wind.

Tonight: Mainly cloudy with isolated flurries. Trace of precip. Alpine low -22 C. Light W wind.

Monday: Cloudy with sunny periods. Alpine high -22 C. Light west wind.

Snowpack Summary

Snow from the Feb 2 storm has been redistributed by strong south winds, followed by a switch to northwesterlies in some locations. The Jan 26 persistent weak layer is buried 60-80cm and consists of decomposing surface hoar in sheltered areas and a thin crust on solar aspects. The mid and lower snowpacks are strong, with no current concerns.

Avalanche Summary

Yesterday, field teams were able to trigger small, very soft slab avalanches over a crust on a south aspect at treeline.  Yesterday evening, an isolated natural avalanche cycle occurred on steep, south aspects in the alpine where a switch to northerly winds was seen.

Confidence

Due to the number of field observations

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.