Up to 30 cm of new snow & strong winds will build reactive slabs.
The danger will rise as new snow accumulates.
Cornices are large and fragile this time of year, the new storm will be building them up even further. Avoid travelling on or under them.
Up to 30 cm of new snow on Tuesday, combined with strong southerly winds, will build fresh and reactive storm slabs. These slabs will be most prone to triggerig on lee northerly slopes.
Sunday
A skier was caught in a small slab: MIN.
Explosives triggered a few size 1 to 1.5 wind slabs and cornices.
Saturday
Explosives triggered several size 1 -2 wind slabs and cornices, and one size 2.5 slab.
Last week
A widespread cycle of wet avalanches occurred during the atmospheric river , producing avalanches up to size 4, along with large cornice failures.
Incoming
Precipitation and wind from Tuesday’s storm are increasing the likelihood of avalanche activity.
Up to 30 cm of new snow is expected to accumulate by the end of Tuesday, accompanied by strong southerly winds. These conditions are set to build fresh and reactive new storm slabs.
The new snow will be falling on 2 to 10 cm of recent snow that is covering a widespread, thick and hard crust below about 2000 m, or old wind-affected snow at upper elevations.
Deeper in the snowpack, older weak layers currently buried 70–100+ cm have likely gained strength, and are not considered a problem at this time.
Monday Night
Mostly cloudy. 2 to 5 cm of snow. 20 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level falling to 900 m.
Tuesday
Cloudy. 15 to 30 cm of snow, possible rain below 1300 m. 50 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level rising to 1500 m.
Wednesday
Mostly cloudy. 10 to 35 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level rising to 1100 m.
Thursday
Mostly cloudy. 2 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -7 °C. Freezing level rising to 1100 m.
More details can be found in the Mountain Weather Forecast.
