Avalanche Forecast

Issued: Apr 6th, 2023 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is moderate. Known problems include Persistent Slabs and Storm Slabs.

Avalanche Canada CB, Avalanche Canada


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.




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.


Persistent Slabs

An icon showing Persistent Slabs

Use caution on solar slopes where a sun crust in present down 10-35 cm. On polar aspects, this interface is spotty surface hoar and facets. The forecasted storm will load this weak layer and increase the likelihood of triggering and expected avalanche size.

Aspects: All aspects.

Elevations: Alpine, Treeline.


Possible - Likely

Expected Size

1 - 2

Storm Slabs

An icon showing Storm Slabs

An incoming storm will start to build a storm slab Friday. Moderate SW winds will deposit snow on lee slopes in exposed areas. Rain is possible below treeline, which will further destabilize the snowpack. Watch of signs of unstable snow such as cracking, whumpfing and recent avalanche activity.

Aspects: All aspects.

Elevations: All elevations.


Unlikely - Possible

Expected Size

1 - 2

Valid until: Apr 7th, 2023 4:00PM