Avalanche Forecast
Issued: Mar 26th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
astclair,
Avalanche Canada
Recent snow and wind may form unstable snow on isolated terrain features.
Summary
Confidence
Weather Forecast
Thursday night: Cloudy, light to moderate southwest wind, freezing level dropping to 800 m, alpine temperatures reach -6 C.
Friday: Cloudy, isolated flurries with trace accumulations, light to moderate southwest wind, freezing level climbing to 1500 m in the afternoon, alpine temperatures reach -3 C.
Saturday: Mix of sun and cloud, isolated flurries with trace accumulations, light southwest wind, freezing level climbing to 1700 m, alpine temperatures reach -1 C.
Sunday: Increasing cloud, 5-10 cm of snow, moderate southwest wind, freezing level climbing to 1800 m, alpine temperatures reach -1 C.
Avalanche Summary
No recent avalanches have been reported, but mountain travel and field observations have been very limited over the past few days. Recent snow could form thin wind slabs with the potential to be reactive above the surface hoar that formed over the past week.
Snowpack Summary
Incremental flurries over the past several days may have accumulated up to 10 cm. This snow sits above a variable mix of crusts, moist snow, and hard old wind slabs. It may also sit above some small surface hoar on shaded aspects. There is some uncertainty about how well the new snow will bond to these interfaces. Weak layers in the upper snowpack have trended towards dormancy. The most prominent and widespread layer was buried in late February and is now 40 to 80 cm deep. This layer was most commonly found in open trees and has produced a few isolated avalanches over the past month.
Terrain and Travel
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Avoid terrain traps where the consequence of any avalanche could be serious.
Problems
Wind Slabs
Light accumulations of snow and recent strong southwest wind have potentially formed wind slabs in steep alpine terrain. There is uncertainty about how well these slabs will bond to underlying interfaces.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Mar 27th, 2020 5:00PM
