Avalanche Forecast
Issued: Dec 7th, 2019 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
ldreier,
Avalanche Canada
Strong southerly wind has formed reactive wind slab at upper elevations.
Summary
Confidence
Weather Forecast
SATURDAY NIGHT: Cloudy with some flurries, 30 km/h wind from the west, alpine temperature at -4 C, freezing level is lowering to valley bottom.
SUNDAY: Mix of sun and cloud, 30 km/h wind from the north, alpine high temperatures around -3 C, freezing level at 1200 m.
MONDAY: Mix of sun and cloud, light wind from the west, alpine high temperatures around +2 C, freezing level at 1600 m.
TUESDAY: Cloudy with isolated flurries, 30 km/h wind from the southwest, alpine high temperatures around -3 C, freezing level at 1200 m.
Avalanche Summary
Several small slab avalanches were triggered remotely by humans on unsupported slopes on northern aspects in the alpine on Saturday. They were 20-50 cm thick.
A few small (size 1) slab avalanches were triggered by skiers and explosives on Wednesday. They were 20-30 cm thick and ran on a hard crust.
Snowpack Summary
The last storm brought up to 10-15 cm of new snow with strong southerly winds at upper elevations in the last few days. The new snow is heavy due to the warm temperatures. Not to far beneath this new snow is a hard crust that formed in late November. Recent snowpack tests have shown notable results on this crust. The snow above this crust is weak and provides a bed surface for avalanches to run on. Whumpfing and shooting cracks were reported in the alpine.
Typical snowpack depths in the alpine currently range between 50 and 150 cm, depending on the amount of wind affect. Snowpack depths taper quickly with elevation as most below treeline terrain is still below the threshold for avalanches.
Problems
Wind Slabs
Strong wind from the south transported the recent storm snow and created wind slabs which are 20-50 cm thick depending on the wind load. Due to the warm temperatures the recent storm snow is heavy and sits on a weak facet/crust layer.
Cornices have formed with the strong wind and if they fail their load can trigger avalanches on the slopes below.
Aspects: North, North East, East, West, North West.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Dec 8th, 2019 5:00PM
