Avalanche Forecast
Issued: Nov 22nd, 2015 9:05AM
The alpine rating is below threshold, the treeline rating is below threshold, and the below treeline rating is below threshold.
Known problems include Wind Slabs.
jlammers,
Avalanche Canada
Given the very limited information on hand for this bulletin, I would tread cautiously and take the time to gather snowpack information as I go. As always, we would love for you to submit any observations from your day to the
MIN.
Summary
Weather Forecast
On Monday, a fast-moving Pacific frontal system will bring 10-20cm of new snow, moderate southwest winds and freezing levels at about 500m. Expect a clearing trend on Tuesday and Wednesday as a dry ridge of high pressure sets up over the region. Ridgetop winds associated with the ridge should remain northeasterly, blowing up to 60kmh on Tuesday, then easing somewhat on Wednesday. Freezing levels on Tuesday and Wednesday should hover around valley bottom.
Avalanche Summary
No recent avalanches have been reported. New snow and wind forecast for Monday will likely promote a fresh round of wind slab avalanche activity.
Snowpack Summary
Snow depths are highly variable across the region; however, slopes below treeline are below threshold for avalanche activity. A dusting of loose snow overlies a widespread rain crust that is reported to exist up to about 2100m in many parts of the region. A Mountain Information Network report near Elfin Lakes also indicated surface hoar development above the crust. New snow forecast for Monday may bond poorly to this potentially weak surface structure. Where the near-surface crust is robust (>1cm thick), the upper snowpack has gained strength and avalanches failing on deeper layers have become much less likely. I'd be extra cautious in areas where the near-surface crust is thin or has not formed (I'm thinking high alpine terrain or northern parts of the region). In these areas, deeper persistent weak layers may still be sensitive to human triggering.
