Avalanche Forecast

Archived

Mar 9th, 2024–Mar 10th, 2024

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Below Threshold.

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely.

Below Treeline

Below Threshold.

Alpine

Natural avalanches unlikely.

Treeline

Natural avalanches unlikely.

Below Treeline

Below Threshold.

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West.

Choose terrain that is sheltered from the wind for the best riding and the lowest avalanche danger.

Recently formed wind slabs may not be sticking to the hard surface underneath.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been reported.

On Wednesday, a large (size 2) avalanche was reported on a north aspect in the alpine. It is suspected to have failed on a layer of surface hoar that has produced a few isolated but surprising avalanches over the last couple of weeks, See photo below. Field observations have been limited, if you're out in the backcountry please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

Up to 20 cm of recent snow covers old, firm, wind-affected or crusty surfaces. Moderate to strong southeast through southwest wind has likely formed deeper deposits of fresh, reactive wind slab that may not be sticking well to the old surface. In isolated areas buried surface hoar can be found 20 to 40 cm deep.

Below 1500 m, a thick melt-freeze crust is buried 50 to 100 cm deep.

The mid-pack is generally strong and bridges the weak crystals at the base of the snowpack.

The average snowpack depth at treeline is around 200 cm.

Weather Summary

Saturday Night

Mostly cloudy. No new snow expected. Moderate southwest ridgetop wind. Treeline low around -10 °C.

Sunday

Mostly cloudy. No new snow expected. Moderate southeast ridgetop wind. Treeline high around -5 °C.

Monday

Mostly cloudy. 3 to 6 cm of snow expected. Moderate to strong south ridgetop wind. Treeline temperature around -8 °C.

Sunday

Mostly cloudy. 2 to 4 cm of snow expected. Moderate southeast ridgetop wind. Treeline high around -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

Seek out sheltered terrain where new snow hasn't been wind-affected.
Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
Carefully evaluate steep lines for wind slabs.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.