Blue River

Above freezing alpine temperatures mean persistent weak layers will remain a concern.

Steep, convex and shallow areas are where triggering is most likely.

On Wednesday, a few large (size 2 to 3) natural and explosive triggered persistent and deep persistent slabs were reported in the alpine. A few smaller (size 1.5) natural windslab and storm slabs have also been seen.

Moving forward, natural avalanche activity has tapered, but large human-triggered slabs remain possible.

Generally wind affected snow is present on the surface in the alpine and treeline. Below treeline a new crust is on or near the surface.

The mid pack contains several layers of note; a layer of surface hoar and a crust down 20 to 40 cm, a significant crust from the early December rain event down around 50 cm and a layer of surface hoar down 50 to 90 cm.

The make up of the lower snowpack is variable throughout the region, in shallower snowpack areas, basal facets exist. This is most concerning in shallow alpine areas.

Friday night

Clear with no new snow. Southeast alpine wind 10 to 30 km/h. Freezing level up to 2400 m.

Saturday

A mix of sun and cloud, no new snow. Southeast alpine wind 10 to 30 km/h. Freezing level up to 1700 m, with the potential for an above freezing layer in the alpine up to 2400 m.

Sunday

Mainly cloudy with isolated flurries, 1 to 3 cm accumulation. Southwest alpine wind 10 to 30 km/h. Treeline temperature -2 C.

Monday

Mainly cloudy with isolated flurries, 1 to 3 cm accumulation. Southwest alpine wind 10 to 40 km/h. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

• Keep in mind that human triggering potential persists as natural avalanching tapers off.
• Use careful route-finding and stick to moderate slope angles with low consequences.
• Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
• Overhead hazard may not be obvious, evaluate prior to commiting to terrain.