Avalanche Forecast

On Monday in the neighbouring region to the south, a serious skier-triggered avalanche incident occurred in the Selkirks near Revelstoke. The avalanche was on an east aspect at 1900 m. It occurred on a steep, unsupported open slope below treeline and failed on a weak layer of surface hoar buried in early January. This large avalanche (size 2) had a crown depth of 50 cm. Details are still emerging about this event.

Also on Monday, several natural wind slabs (size 1-2) and a few natural deep persistent slabs (size 2-3) were reported. These avalanches occurred in the alpine in wind-loaded terrain.

On Saturday a serious avalanche Incident occurred, which resulted in a fatality, occurred in the Oasis riding area south of Valemont. The avalanche was on a north-northwest aspect at 2100 m. It was remotely triggered and ran on the November facets near the bottom of the snowpack. This large avalanche (size 2.5) had a depth of 80 to 120 cm. There were several other reports of human-triggered avalanches from nearby areas.

This MIN describes a close call on Sunday.

All of these very large avalanches occurred at upper treeline/lower alpine. Avalanches like these are most likely to be triggered on steep, shallow and previously undisturbed slopes. Your best defence at this time is to stay diligent in choosing conservative and low-consequence terrain. Stick to slopes that have been heavily trafficked throughout the winter and avoid venturing into untouched zones. Adjust your goals to match conditions. This is not a time to tick off objectives, but rather to enjoy lower-angled riding, spend time outdoors with friends, and get exercise in the outdoors. Stay disciplined and adjust your expectation for this winter.

New snow continues to gradually accumulate. Westerly winds will continue to affect exposed terrain and form wind slabs near ridgetops. 20 to 60 cm of recent snowfall sits above a layer of surface hoar as well as a sun crust on steep solar aspects. At lower elevations, recent snow is accumulating above a rain crust.

A prominent layer of buried surface hoar can be found roughly 40 to 80cm deep. It is spotty in nature but has shown ongoing signs of instability in many parts of the region.

Large, weak facets buried in November are widespread at the base of the snowpack. This layer has been most problematic to date in thin, rocky areas in the alpine and treeline.

Tuesday night

Mainly cloudy with flurries, less than 5 cm accumulation with isolated areas up to 10 cm. Alpine temperatures rise to -4 C. Ridge wind northwest 30- 60 km/h. Freezing level rises to 1400 m.

Wednesday

Mainly cloudy with isolated flurries. Alpine temperatures rise to -1 C. Ridge wind northwest 30-80 km/h. Freezing level rises to 1600 m.

Thursday

Cloudy with flurries, up to 5 cm of accumulation. Alpine temperatures around -3 C. Rdige wind northwest 40-90 km/h. Freezing level remains elevated around 1500 m.

Friday

A mix of sun and cloud with flurries. Alpine temperatures drop to -8 C. Ridge wind northwest 25-50 km/h. Freezing level drops to 500 m.

More details can be found in the Mountain Weather Forecast.

• Be mindful that deep instabilities are still present and have produced recent large avalanches.
• Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
• Storm slabs in motion may step down to deeply buried weak layers resulting in very large avalanches.
• Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.