Between Storms & Structure?
I don’t have a very clear picture of the snowpack right now, mostly because I haven’t been out as much as I’d like. From what I can gather, we had some decent early-season snowfall through late October and early November before it dried up for a while. A warm spell in mid-November then formed a widespread rain crust, reaching an elevation of about 2100–2200 metres. That crust is now buried fairly deep, and it seems like most of what we’re dealing with now are various storm interfaces, with the occasional surface hoar layer lingering in more isolated treeline spots. With that broader context in mind, the immediate question is how the recent storms are building on this structure and what that means for travel and decision-making going forward.
Looking ahead, a series of warm atmospheric river events loaded with subtropical moisture and strong winds is forecast to impact the Pacific Northwest and southern BC through approximately mid-December. While this should bring ample precipitation, warmer temperatures and winds are likely to continue complicating the snowpack, especially at lower and mid elevations. Beyond December 15, the longer-term outlook seems somewhat more promising, with signs that cooler air may eventually return to the region. However, the current warm spell may take some time to dissipate entirely.
We were out teaching an avalanche course behind Sun Peaks on Sunday. December 14th, which helped clarify some of this. Snow depths in that area averaged around 85 cm, with a relatively simple structure of two to three layers. One notable layer was a supportive crust at a depth of about 45–50 cm. However, what stood out more than the layering was the temperature. Even on shaded aspects, it was around +4 °C at 2050 metres. We encountered upside-down powder — not ideal for enjoyable riding.
Conditions are clearly in transition, and it feels like winter is finally beginning to lean in. Most forecast areas expect a steady stream of precipitation through the weekend and into the coming week, which means the snowpack we’ve been discussing is about to be tested. As snow continues to accumulate, it’s prudent to step back and choose more conservative terrain while conditions adjust.
Although coverage at lower elevations remains limited, riding conditions at higher elevations have been quite good thus far, with relatively manageable avalanche risk in many areas. However, these conditions are evolving, and the approach that has worked so far might not be practical as the snowpack deepens. Clear, cold periods in mid to late November allowed weak layers to develop at the surface, including thin sun crusts, surface hoar, and facets reported across much of western Canada. In many regions, a November rain crust was later buried and has since developed facets above it. That layer is more likely to cause problems when rain falls on an already supportive snow surface, which is more common in lower-elevation alpine terrain. For now, it appears that the more recent layers at higher elevations in the snowpack are the primary concern.
Recently, lighter snowfall has gradually accumulated on these weak layers. With more snow expected—and possibly intensifying—it wouldn’t take much to tip the balance towards more reactive slab conditions. As these weak layers become more deeply buried, the risk of wider propagation and remote triggering grows.
In the near term, it’s wise to take a cautious approach. For now, keep things small and low risk, while closely monitoring snow conditions throughout the day. Below the treeline, coverage remains sparse in many areas, with rocks, stumps, and open creeks just beneath the surface. Fresh snow will make spotting these hazards more difficult, so it’s essential to plan your exits and travel routes as carefully as the descent itself.
Always check your favourite weather apps and online resources — sites like Windy.com and YR.no are good places to start — and make a habit of reviewing Avalanche Canada before heading out. If you’re planning to visit a backcountry lodge or hut and will be travelling without a guide, it’s worth taking the time to read through the BLBCA’s Recommendations for Self-Guided Groups. The purpose of that document is simple: to offer some common-sense practices that help keep people safe, without taking away from the stoke we’re all chasing when we head into the mountains. Having fun and being safe aren’t mutually exclusive.
Brad Harrison
Colwest Alpine Adventures
www.colwest.ca
Professional Member, Canadian Avalanche Association
Executive Director, Backcountry Lodges of BC Association


