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Avalanche Forecast

Archived

Nov 27th, 2024–Nov 28th, 2024

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead, Akamina, Flathead, Lizard, Moyie, St. Mary, Crowsnest South.

Fresh and reactive wind slabs may form at treeline and above. Start conservative and watch for signs of instability like cracking or whumpfing.

Confidence

Low

Avalanche Summary

Natural avalanche activity has tapered. Large triggers like explosives continue to trigger slab avalanches up to size 2 on Wednesday.

Last weekend a natural avalanche cycle occurred, and numerous storm slab avalanches were reported up to size 2.5 in the alpine and treeline.

Forecast light to moderate winds may form reactive wind slabs in exposed terrain features, especially near ridgeline.

If you head out please consider submitting a MIN.

Snowpack Summary

Up to 30 cm of snow fell last weekend. This brings storm snow accumulations around 50 to 60 cm over the past week. Reports specifically from the Lizard Range show a buried layer of graupel down 60 (ish) cm.

Stiffer wind-affected snow may be found near ridgelines and on open slopes. The surface snow remains soft in wind protected areas, like the trees.

The bottom of the snowpack has a crust that sits just above the ground. Snowpack depth is 100-180 cm at treeline.

Weather Summary

Wednesday Night

Cloudy with isolated flurries. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -7 °C.

Thursday

Mostly cloudy with isolated flurries. 10 to 40 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Friday

Cloudy with sunny periods. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Saturday

Cloudy with isolated flurries 2 to 5 cm. 10 to 25 km/h southwest ridgetop wind. Treeline temperature -8 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Use caution above cliffs and terrain traps where even small avalanches may have severe consequences.
  • Seek out sheltered terrain where new snow hasn't been affected by wind.

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.