The danger may be Moderate, but the presence of a persistent slab problem demands conservative terrain choices and disciplined backcountry travel techniques.
Avoid likely trigger spots such as steep, rocky slopes with a shallow or thin to thick snowpack.
Recent snow and strong southerly winds formed wind slabs on lee features in open terrain that may remain reactive to human triggers.
A layer of weak facets (sugary snow) can be found down 50-100 cm near a crust layer that formed in early December. The persistent slab problem may be possible to human trigger. Avoid likely trigger spots such as steep, rocky slopes with a shallow or thin to thick snowpack.
WEDNESDAY NIGHT: Cloudy / Light, southwesterly winds / Low of -12 C / Freezing level surface.
THURSDAY: Mix of sun and cloud / Light, northwesterly winds / High of -6 C / Freezing level 200 m.
FRIDAY: Mix of sun and cloud / Light, westerly winds / High of -9 C / Freezing level surface m.
SATURDAY: Snow; 5-10 cm / Strong, southwesterly winds / High of -3 C / Freezing level 500 m.
Check out this recent MIN report of a naturally triggered size 3.5 storm slab avalanche reported on Sunday near Mt. Pierce.
In the neighboring Sea to Sky region, we received recent reports of four large (size 2-2.5) explosive-triggered persistent slab avalanches failing on the early December crust/facet layer. These occurred on northwest and northeast aspects in the alpine.
Recent snow and strong southerly winds formed wind slabs on lee features in open terrain that may remain reactive to human triggers.
The primary layer of concern in the snowpack is a crust down 50-100 cm that was formed in early December. This layer has a weak layer of small facets (sugary snow) above it that will result in large avalanches if triggered.
This has created a Persistent slab problem that is tricky to manage and likely to surprise riders who choose to ride steep, rocky slopes with a shallow or thin to thick snowpack.
It's tricky to manage because it's unlikely to trigger this layer on many slopes, but the consequence of triggering it is massive.
This scenario requires conservative terrain choices and disciplined backcountry travel techniques.
