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Avalanche Forecast

Archived

Nov 25th, 2024–Nov 26th, 2024

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

Regions

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

The fresh snow has formed touchy storm slabs, especially in wind exposed terrain.

Stay conservative and watch for signs of instability.

Confidence

Low

Avalanche Summary

Last weekend a natural avalanche cycle occurred, and numerous storm slab avalanches were reported up to size 2.5 in the alpine and treeline. Dry loose avalanches up to size 1.5 were also reported from steep and unsupported slopes.

Forecast light to moderate winds may form reactive wind slabs in exposed terrain features.

If you head out into the backcountry, please submit a MIN.

Snowpack Summary

10 to 15 cm of new snow fell on Sunday and Monday. 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.

In wind-exposed terrain, the new snow has likely stiffened into a slab and may be reactive to riders.

The bottom of the snowpack has a crust that sits just above the ground. The crust has acted as a bed surface for recent large avalanches.Snowpack depth is 100-180 cm at treeline.

Weather Summary

Monday Night

Cloudy with 2 to 5 cm of snow. 15 gusting to 40 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level valley bottom.

Tuesday

Cloudy with some sunny periods. 10 to 25 km/h west ridgetop wind. Treeline temperature -5 °C.

Wednesday

Mostly cloudy with isolated flurries. 15 to 20 km/h northwest ridgetop wind. Treeline temperature -8 °C.

Thursday

Mostly cloudy with isolated flurries. 10 to 20 km/h west ridgetop wind. Treeline temperature -8 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.