Avalanche Forecast
Issued: Dec 14th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
mconlan,
Avalanche Canada
The primary concern for Tuesday is in steep, wind-loaded terrain features near ridges. Sheltered terrain will likely offer the softest riding conditions.
Summary
Confidence
Moderate - Uncertainty is due to the limited number of field observations.
Weather Forecast
MONDAY NIGHT: Cloudy with isolated snowfall, 30 to 50 km/h west wind, alpine temperature -9 C.
TUESDAY: Cloudy with snowfall, accumulation 5 cm, 40 to 80 km/h west wind, alpine temperature -8 C.
WEDNESDAY: Mix of sun and cloud with isolated flurries, accumulation 5 cm, 20 to 40 km/h west wind, alpine temperature -6 C.
THURSDAY: Cloudy with snowfall, accumulation 10 to 15 cm, 30 to 60 km/h southwest wind, alpine temperature -4 C.
Avalanche Summary
Small (size 1 to 1.5) wind slab avalanches were observed out of steep terrain on Sunday and Monday, being triggered naturally and by riders.
Please consider sharing your observations on the Mountain Information Network. Thank you to those that have already submitted this winter.
Snowpack Summary
The snowpack depth varies substantially in the region and has been described as thin, wind-hammered, variable, and tapering rapidly at lower elevations. The average snowpack depth at treeline is approximately 100 cm.
Up to 30 cm of snow from last week overlies a hard melt-freeze crust formed in early December at least up to 2000 m. To date, this layer has not been an avalanche concern but use caution if you find cohesive snow above the crust, particularly if there are weak, sugary faceted grains or feathery surface hoar crystals above the crust. Strong wind from the southwest is forecast on Tuesday along with a bit of new snow, which may form new wind slabs above this crust.
The middle of the snowpack has been reported as being well-consolidated and may host another hard melt-freeze crust.
The base of the snowpack consists of a hard melt-freeze crust from early-November that may have faceted grains around it. There has not been recent avalanche activity on this layer but it remains on our radar. The most likely spot to trigger it would be on thin and rocky slopes.
Terrain and Travel
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Avoid areas where the snow feels stiff and/or slabby.
Problems
Wind Slabs
Strong southwest wind is forecast for Tuesday along with a bit of new snow. Use caution near ridges, particularly where you find slab properties in the surface snow.
Aspects: North, North East, East, South East, South, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Dec 15th, 2020 4:00PM
