Avalanche Forecast

Moderate - Wind effect is extremely variable

The dominating arctic airmass will linger through the weekend with continued cold temperatures at valley bottom and a strong alpine inversion, mostly cloudy skies with some sunny periods. Saturday/ Sunday/ Monday: Mix of sun and cloud with an alpine high near -8. Ridgetop winds light from the West. Check out the full synopsis here: https://avalanche.ca/weather/forecast

On Thursday, wind slabs up to size 1 were easily triggered by the weight of a person. Variability in the winds has been the name of the game and reactive wind slabs may be found on all aspects at upper elevations.

Up to 20 cm of recent snow has buried a variety of old snow surfaces. These consist of heavily wind scoured areas and old wind slabs, surface hoar in sheltered areas, and widespread faceted (sugary) old snow. Recent moderate winds from a variety of directions has redistributed some of this new snow on leeward slopes, forming reactive wind slabs. The mid pack appears to be quite variable throughout the region and the structure is dependent on snow depth. 50-80 cm of consolidated snow sits above the mid-December facets. In deeper snowpack areas, the snowpack appears to be well settled and right side up with isolated concerns for the mid-December weak layer. In shallow snowpack areas and lower elevations, the snowpack is heavily faceted and there are concerns for the mid-December weak facet layer as well as weak basal facets. If a persistent slab is triggered from thinner snowpack areas it may release on the basal facets (full depth avalanche). At this point it seems like a low probability, high consequence scenario. However; once the snowpack starts to see a big change, like warming then the likelihood of triggering may increase.