Avalanche Forecast

A small (size 1) slab avalanche was reported near White Pass last weekend. (See photo below.)

Cornice falls were observed to have triggered large avalanches last weekend and are expected to remain weak.

Small wet avalanches were observed on south-facing slopes in the heat of the day over the last week, but are now unlikely with the forecast cool and cloudy conditions.

5 to 10 cm of recent snow at upper elevations overlies a widespread crust that exists up to roughly 1300 m. Daytime warming may soften this crust at low elevations.

At higher elevations, the snow is likely to be wind-affected. Large, fragile cornices can be found on exposed ridgelines and should be given a wide berth.

Soft dry snow may still be found on north-facing alpine slopes.

In some areas, a weak layer of facets or surface hoar is buried 50-80 cm. This layer is unlikely to trigger from the weight of a rider, but concern exists with very large loads like cornice falls.

Check out this MIN for recent conditions near White Pass, and this MIN for the Haines area.

Tuesday Night

Mostly cloudy with 0 to 5 cm of snow possible. 15 km/h southeast ridgetop wind. Treeline temperature drops to around -5 °C.

Wednesday

Mostly cloudy with a trace of new snow possible. 20 km/h east ridgetop wind. Treeline temperature 0 °C. Freezing level rising to 1100 m.

Thursday

Partly cloudy. 15 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level rising to 800 m.

Friday

A mix of sun and cloud. 20 km/h west ridgetop wind. Treeline temperature rising to -1 °C. Freezing level rising to 800 m.

More details can be found in the Mountain Weather Forecast.

• When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.
• Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.
• Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.