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Avalanche Forecast

Archived

Mar 15th, 2025–Mar 16th, 2025

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

Regions

North Rockies, Sugarbowl, East Kakwa, Kakwa, McGregor, Pine Pass, Renshaw, Tumbler.

Recent storm snow may need extra time to settle. Use caution, especially where more than 20 cm has accumulated.

Confidence

Moderate

Avalanche Summary

Throughout this past week, a few small to large (size 1 to 2) wind slab avalanches out of steep alpine terrain where reported.

Snowpack Summary

20 to 30 cm of snow that in isolated areas is up to 60 cm has accumulated in the past week. This storm snow has formed a slab and overlies a hard melt-freeze crust and perhaps isolated surface hoar crystals in wind-sheltered treeline terrain.

Variable winds have created windslabs on all aspects near or just below ridge crests.

The snow may be deeper and touchier in wind-exposed lee features.

A weak layer of surface hoar and/or faceted grains buried mid-February is around 50 to 100 cm deep, but is showing signs of strengthening.

The lower snowpack is well-settled.

Weather Summary

Saturday Night

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

Sunday

Mix of sun and cloud with 1 to 5 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Monday

Mix of sun and cloud with 1 to 5 cm of snow. 40 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Tuesday

Mix of sun and cloud with 1 to 5 cm of snow. 40 to 50 km/h west ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large avalanches due to buried weak layers.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Even brief periods of direct sun could produce natural avalanches.

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.