Deeply buried weak layers are expected to become active with rising freezing levels.
Choose conservative terrain free of overhead hazards.
The snowpack is weak and facetted. This MIN captures the problem well. If triggered it could step down to the deep persistent problem.
Even small avalanches could step down to deeply buried weak layers.
If triggered, this problem will likely be the full depth of the snowpack and could run below treeline. Avoid shallow, rocky start zones.
There have been many large (size 2) to very large (size 4) rider-triggered avalanches on deeply buried weak layers in the Purcells this week. Mainly in the alpine but with whumpfing reported below treeline as well.
There are various old surfaces including recent snow settling, wind-affected snow, and sugary facets.
The mid-snowpack has a couple of crusts and is generally faceted and weak above them.
At the base of the snowpack, weak faceted grains and depth hoar are present.
Saturday Night
Cloudy with a trace of snow, southwest alpine wind 15 to 30 km/h, treeline temperature -2 °C.
Sunday
Mostly cloudy with 5 to 10 cm of snow, southwest alpine wind 20 to 40 km/h, treeline temperature 0 °C, freezing level 2000 m.
Monday
Mostly cloudy with no new snow, southwest alpine wind 30 to 50 km/h, treeline temperature 3 °C, freezing level 2500 m.
Tuesday
Mostly cloudy with a trace of snow, southwest alpine wind 20 to 40 km/h, treeline temperature 3 °C, freezing level 2200 m.
More details can be found in the Mountain Weather Forecast.
