Persistent Slabs
- Alta montaña
- Límite del bosque
- Bajo el límite del bosque
- Probabilidad
- Possible
- Tamaño
- 1.5–3
Weak layers exist 40 to 100 cm deep. These layers remain a concern where there is no thick, supportive crust under the recent snow.
Continue to choose simple, mellow terrain. Signs of buried weak layers may be hard to find.
Be especially cautious on high north-facing slopes, and steep slopes in the sun.
Weak layers exist 40 to 100 cm deep. These layers remain a concern where there is no thick, supportive crust under the recent snow.
Wet loose avalanches will become possible in steep terrain if the sun is out for prolonged periods. Avoid overhead hazard from sun-exposed slopes, especially if the snow surface is moist or wet.
On Wednesday, mostly small, rider triggered dry and wet loose avalanches were reported in steep terrain.
Looking forward: Avalanches on buried weak layers may be difficult to trigger, but if one is triggered, it is likely to be large and destructive.
The upper snowpack is currently quite variable on different aspects, and across the forecast area. 5 to 15 cm of new snow is settling over a widespread melt-freeze crust that exists everywhere but some high north-facing slopes. This crust has been reported to be generally supportive to skis, and anywhere from a couple cm to 20 cm thick. In some places, there is even a thin, breakable crust on shaded alpine slopes.
Two concerning weak layers are present in the mid snowpack: facets/surface hoar or a crust from mid-February buried 30-70 cm, and faceted snow/surface hoar/crust from late January buried 60-100 cm.
Thursday Night
Clear. 10 to 20 km/h northwest ridgetop wind. Freezing level falling to 1200 m. Treeline low -7 °C.
Friday
Sunny. 15 to 25 km/h southwest ridgetop wind in the afternoon. Freezing level rising to 1900 m. Treeline high 0 °C
Saturday
Mostly cloudy. 15 to 30 km/h southwest ridgetop wind. Freezing level falling to valley bottom overnight, rising to 1700 m through the day.
Sunday
Partly cloudy. 25 to 40 km/h southwest ridgetop wind. Freezing level falling to 750 m overnight, rising to 1700 m through the day.
More details can be found in the Mountain Weather Forecast.