Avalanche Forecast

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TUESDAY NIGHT: Cloudy with clear periods, light wind, alpine temperatures drop to -12 C.WEDNESDAY: Mix of sun and cloud, light southwest winds, alpine high temperatures around -6 C.THURSDAY: Cloudy with light snowfall (2-4 cm), light south wind, alpine high temperatures around -8 C.FRIDAY: Mostly cloudy, trace amounts of snow, light southwest wind, alpine high temperatures around -6 C.

No new avalanches were reported on Tuesday.On Monday, several large (size 2) avalanches were observed throughout the region, some releasing on weak faceted grains near the base of the snowpack.On Sunday, a large (size 3) avalanche ran full-path on a southwest aspect in the alpine near Golden. It also released weak snow near the base of the snowpackOn Saturday, a group of snowmobilers triggered a fatal avalanche near Invermere, also on the basal weak faceted grains. The avalanche was on a southerly aspect and ran approximately 900 to 1100 m. Two snowmobilers were caught. See here for more information.On Friday, five large to very large (size 2 to 3.5) deep persistent slab avalanches were observed on various aspects in alpine terrain.The likelihood of triggering large avalanches is elevated due to the weak nature of the snowpack. Watch out in thin snowpack areas, where the likelihood of triggering deeper layers is the highest. Check out a few of the other recent large and destructive avalanches triggered by people via MIN posts here and here.

The snowpack is weak and touchy in a large portion of the Purcells. Numerous very large avalanches have been reported daily. This is the type of weak snowpack that could stick around for months. Read more here. At the top of the snowpack, recent warm air and sunny skies may have produced a crust on the snow surface. Expect to find a sun crust on southerly aspects and possibly a temperature crust on other aspects. At higher elevations in exposed terrain, wind slabs may still exist.The weak nature of the snowpack lies at depth. There is a weak layer around 80 to 120 cm deep, composed of sugary faceted grains, feathery surface hoar, and a sun crust. The base of the snowpack is also composed of weak faceted grains in many parts of the region. Humans have and will continue to be able to trigger these layers in areas where the snowpack is shallow.