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Avalanche Forecast

Archived

Mar 30th, 2022–Mar 31st, 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.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Natural avalanches subsided on Wednesday, with cooler temps and less solar input. The snowpack still requires more cooling before it can fully heal from previous warmth, rain, and sun.

Weather Forecast

Wednesday Night: Cloudy with flurries, Low of -9

Thursday and Friday: Mix of sun, cloud, and flurries, Alpine high temp of -8, winds 20-40kmph, and the Freezing level making it to 1500m

Snowpack Summary

Below treeline and on solar aspects to treeline the snowpack is probably isothermal with a weak crust, and or new snow capping the surface. At higher elevations, there is likely ~10cm of new snow overlying a variety of surfaces including, previous heavier snow, wind slabs, and possibly crusts. 

Avalanche Summary

On Monday and Tuesday there was a widespread natural avalanche cycle, primarily on lower elevations and solar aspects including wet slabs, deep persistent slabs, glides, and loose wets to size 3! Some avalanches gouged to ground, breaking trees, and running full path!

Confidence

Problems

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.

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.