A warm storm moving through British Columbia this weekend is heightening avalanche risks during a time of year historically known for being the deadliest for avalanches in Canada. Environment and Climate Change Canada predicts that the system will bring precipitation, strong winds, and elevated freezing levels across much of the province.
Meteorologist Brian Proctor from the weather agency explained that the situation will likely lead to increased snowfall at higher elevations over the weekend. Avalanche threats are expected to peak on Saturday in regions such as the South Coast, including the North Shore Mountains, with freezing levels anticipated to rise above 1,500 to 1,800 meters.
The forecast indicates that the combination of rain falling on existing snow in mountainous areas can escalate avalanche risks. Karina Bakker, a forecaster with Avalanche Canada, highlighted that new snow or rain on top of existing snow layers can intensify pressure on those layers, making them more prone to collapse or sliding.
The current risk is attributed to “persistent slab” conditions, involving a layer of snow resting above weaker snow buried deeper in the snowpack. This setup can lead to slab avalanches when the weaker layer gives way under the weight of the snow above, causing a slide down the slope.
March poses a heightened danger as historically it records the highest number of avalanche fatalities in Canada. The evolving snowpack complexity over the winter months contributes to the increased risk during this time. Avalanche Canada advises individuals venturing into the backcountry to follow daily forecasts diligently and opt for conservative terrain choices to ensure safety.