Sun, warm temperatures, and a complex snowpack are causing multiple avalanche problems. Very dangerous avalanche conditions are expected on Wednesday.
Recently formed wind slabs are expected to remain reactive, and human-triggering remains possible.
Cornices are also expected to become weak with mild temperatures and sun, and natural cornice failures are possible.
Deeply buried weak layers are expected to become reactive with mild temperatures and sun, and very large natural avalanches should be expected on Wednesday.
Natural wet loose avalanches are expected from steep, sun-exposed slopes.
Cornices are also expected to become weak with mild temperatures and sun, and natural cornice failures are possible.
On Monday, several natural persistent slab avalanches were reported up to size 3, several of which failed on the weak layer from early March. Some of these were triggered by cornice failures, and two were remotely triggered from up to 100 m away. Some natural wind slab avalanches were also observed.
On Sunday, a size 2 avalanche was rider-triggered on a northwest aspect in the alpine. This avalanche was believed to have occurred on the February drought layer.
50-100 cm of recent snow has been redistributed by variable winds. This snow fell on previously wind-affected surfaces and crusts on steep south-facing terrain.
Three layers of concern currently exist in the upper-mid snowpack. Surface hoar that formed in mid-March can be found 65-85 cm below the snow surface. Below this, another layer of surface hoar that formed in early March can be found at a depth of 90-125 cm. Additionally, a layer of facets, surface hoar, and/or a crust from mid-February is buried 115-195 cm deep.
The remainder of the snowpack is well consolidated, and there are no current concerns.
Tuesday Night
Mostly cloudy. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -2 °C.
Wednesday
Mostly sunny. 20 to 30 km/h northeast ridgetop wind. Treeline temperature 0 °C. Freezing levels 1400 m.
Thursday
Mostly sunny. 20 to 40 km/h northeast ridgetop wind. Treeline temperature -1 °C. Freezing levels 1200 m.
Friday
Mostly sunny. 30 to 50 km/h east ridgetop wind. Treeline temperature -3 °C. Freezing levels 1000 m.
More details can be found in the Mountain Weather Forecast.
