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Avalanche Forecast

Archived

Apr 6th, 2023–Apr 7th, 2023

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

Regions

Glacier.

Expect changing snow conditions and rising avalanche hazard as an incoming spring storm brings light to moderate snow with moderate SW winds.

If more snow falls then expected, hazard could rise to Considerable in the alpine by Friday afternoon.

Confidence

Moderate

Avalanche Summary

Wed: skier triggered, sz 1, SE asp, alpine behind Mt Bonney. This was a thin slab abv a crevasse failing down ~15 cm.

Wed: natural aval sz 2.5, possible cornice fall off Mt Bonney, MIN.

Tues: Two moist snow skier triggered avals at the top of av crest. These were sz 1.5-2, triggered on a sun at the bottom of the recent storm snow down ~15cm.

Tues: cornice failure from above caught a person on Cheops N 1 , knocking them downslope ~300m.

Snowpack Summary

Expect a surface crust on solar aspects and dry snow on polar aspects. 15-20cm of settled snow is covering the March 31st which is a solid crust on solar aspects and isolated surface hoar/facets on polar aspects.

The mid and lower snowpack is generally strong. However, the basal weakness from November can still be found near the ground in many locations. This layer will remain a concern until the end of the season.

Weather Summary

Frontal system brings snow starting tonight with flurries continuing through Friday, next storm arriving Sunday.

Tonight: Cloudy scattered flurries, Alp low -3*C, mod S wind, FZL 1500m

Fri: Snow, 15-20 cm Alp high -1*C, light gusting to mod SW wind, 2000m FZL

Sat: Snow, 5cm, Alp high -3*C, mod SW wind, 1800m FZL

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.

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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.