Avalanche Forecast

Moderate - Freezing levels are uncertain on Monday

MONDAY: Cloudy with flurries, accumulation 5-10cm / Strong southwest wind / Alpine temperature -2 / Freezing level 1800mTUESDAY: Flurries, accumulation 5cm / Strong west wind / Alpine temperature -4WEDNESDAY: Mix of sun and cloud / Light west wind / Alpine temperature -10

On Thursday explosive control work in the Castle area triggered a Size 3 avalanche from a shallow area that propagated and failed on the late-November layer deep in the snowpack. While in the Bull River area a natural Size 1.5 wind slab avalanche was observed on a northwest aspect at treeline and a natural Size 2 in a west-facing cutblock at 1600 m was reported to have failed on the mid-December layer.The snowpack in the region remains suspect with several buried weak layers displaying classic signs of instability such as whumpfing and cracking. The recent video posted to the Avalanche Canada South Rockies field team Facebook page paints a pretty clear picture. https://www.facebook.com/avcansouthrockies/videos/1894352117306941/.

Amounts vary across the region however, about 20-50 cm of recent storm snow now covers both a new layer of feathery surface hoar in sheltered areas as well as sun crust on solar aspects buried mid-January, and about 30-60 cm below the surfaces lies the early-January surface hoar layer.About 60-80 cm below the surface a weak layer of feathery surface hoar crystals and/or sun crust buried mid-December is found at treeline and below treeline elevations. Near the base of the snowpack the weak early-season layer of rain crust and sugary facets buried late-November exists. Although the snowpack structure is variable across the region, these persistent weak layers are generally widespread. Snowpack depths are also variable across the region and typically thinner in northern areas than in areas to the south.