Storm slabs may remain reactive on Wednesday.
A weak layer of surface hoar is being loaded by snow and recent rain. This weak layer may remain reactive to human traffic wherever it remains intact, particularly at higher elevations where the snowpack is relatively smooth.
We haven't received any reports of avalanche activity in this region but expect that the stormy conditions likely triggered many avalanches. Avalanche activity is likely to decrease as the freezing level drops, but human triggering may remain possible wherever the surface hoar layer described in the Snowpack Summary remains intact.
Wednesday's snow will fall onto a wet snowpack from Monday and Tuesday's rain, which will slowly freeze into a hard melt-freeze crust. This stormy event loaded a feathery surface hoar layer buried about 10 to 20 cm beneath the wet snow.
The middle and base of the snowpack is generally weak and faceted.
Snowpack depths at treeline are approximately 50 to 70 cm. The snowpack tapers drastically with elevation below treeline.
Tuesday Night
Cloudy with trace snow or rain. Southwest alpine wind 20 to 40 km/h. Treeline temperature 0 °C. Freezing level 2000 m dropping to 1500 m.
Wednesday
Cloudy with 10 to 20 cm of snow. Northwest alpine wind 10 to 20 km/h. Treeline temperature -2 °C.
Thursday
Mostly cloudy with trace snow. Southwest alpine wind 10 km/h. Treeline temperature -6 °C.
Friday
Cloudy with 1 to 3 cm snow. West alpine wind 10 to 20 km/h. Treeline temperature -7 °C.
More details can be found in the Mountain Weather Forecast.
