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Avalanche Forecast

Archived

Mar 24th, 2022–Mar 25th, 2022

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

Regions

Glacier.

Weather Forecast

Ridge of high pressure breaks down on Friday with another approaching weather system for the weekend.

Fri: Cloud and sun, Alp Temp: -3, Wind: SW 15-30, Fz lvl: 1800 m

Sat: Flurries, 4 cm, Alp Temp -2, Wind: SW 15, gust to 40, Fz lvl: 1900 m

Sun Flurries, Alp Temp high +1, Wind Light to 20, Fz lvl: 2000 m

Snowpack Summary

10-15 cm new snow overnight Wednesday with moderate winds covers a variety of spring surfaces. These include rain crust up to 2200m and solar crust into the alpine, and remnant wind slabs on alpine polar aspects buried on March 23. The March 11th crust is buried 40-70cm to 2000m and higher on solar asp.

Avalanche Summary

Loose wet natural activity was observed along the highway corridor over Wednesday night and into Thursday. 

Observations of natural activity in the backcountry Thursday included wind slabs and wet slabs, MIN.

On Tuesday there were several loose wet avalanches observed in the HWY corridor, to size of 1.5. 

Confidence

Intensity of incoming weather systems is uncertain

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 Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.