Persistent Slabs
- Alpine
- Treeline
- Below treeline
- Likelihood
- Possible - Likely
- Size
- 2–3
A buried weak layer from early December is expected to produce avalanches under the weight of the new snow.
Avoid all avalanche terrain.
A deeply buried weak layer may cause large avalanches to run to the valley bottom.
A buried weak layer from early December is expected to produce avalanches under the weight of the new snow.
Storm slabs are expected to be easy to trigger. If triggered, they may step down to the persistent problem.
On Sunday, numerous small wet loose avalanches occurred during warm temperatures and sunshine. A few of them triggered wind slabs.
Heavy snowfall is expected to drop 20 to 60 cm by the end of the day Wednesday. This snow falls on:
Large surface hoar crystals in sheltered spots at treeline and below.
Likely a crust on solar slopes.
Old wind affected snow.
A layer of surface hoar from early January is buried 20 to 40 cm deep. It's uncertain whether this layer will persist.
100 to 200 cm deep in the snowpack are layers of crust, facets, and possibly surface hoar that were buried in December.
The lower snowpack is generally well-settled and unconcerning.
Tuesday Night
Cloudy with 15 to 50 cm of snow. 50 to 90 km/h southwest ridgetop wind. Treeline temperature -3 °C.
Wednesday
Cloudy with 5 to 10 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -6 °C.
Thursday
A mix of sun and cloud with 1 to 2 cm of snow. 15 km/h west then east ridgetop wind. Treeline temperature -10 °C.
Friday
Mostly cloudy with 5 to 10 cm of snow. 10 km/h north ridgetop wind. Treeline temperature -12 °C.
More details can be found in the Mountain Weather Forecast.