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Avalanche Forecast

Archived

Jan 19th, 2021–Jan 20th, 2021

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

Regions

Glacier.

A blip of snow and strong winds this afternoon will briefly elevate danger ratings. Be poised to drop into your line early to avoid the weather.

Of note, glide cracks have been active recently. Avoid spending any time under these lurking ogres.

Weather Forecast

A mix of sun and cloud over the next few days, with a weak pulse of snow/wind tonight.

Today: mainly cloudy, brief storm late afternoon with 5-10cm snow and mod/strong SW winds, Alp high -7*C

Wed: sun/cloud with isolated flurries, Alp high -12*C, light W winds

Thurs: sun/cloud, Alp high -10*C, light E winds

Snowpack Summary

Variable snow surface, including a thin suncrust on steep S/SW asp, isolated soft slab at ridge top, and light powder on sheltered slopes. The Jan 10 surface hoar is down 35-65cm in sheltered terrain at tree-line and below. The Dec 7th surface hoar/crust/facet layer is down 1.5m. Crusts with facets at the base of the snowpack.

Avalanche Summary

Few isolated natural sz 2-2.5 avalanches were observed from Lone Pine and the Macdonald gullies yesterday. A glide crack release was reported on the north side of Bruins Pass. With Lone Pine also spitting out a glide crack release last week, and cracks opening on Avalanche Crest and Teddy Bear Trees, these unpredictable hazards need to be watched.

Confidence

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.

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.