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Avalanche Forecast

Archived

Mar 1st, 2025–Mar 2nd, 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 unlikely, human triggered possible.
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, Robson, Tumbler.

Recent avalanche activity indicates an unstable snowpack & remote-triggering remains a serious concern.

Stick to conservative terrain and practice good travel habits.

Confidence

Moderate

Avalanche Summary

In the past week, several natural and rider-triggered wind slab and persistent slab avalanches have been reported, up to size 2.5. These avalanches have mainly occurred in north-to-east facing alpine and treeline terrain.

Similar activity is expected on Sunday with continued warm temperatures and precipitation.

Read more in our Forecasters' Blog.

Snowpack Summary

10 to 20 cm of recent snowfall has been redistributed by strong southwest alpine winds building stiff wind slabs in the alpine and treeline. The new snow was wet or fell as rain in many areas, creating a moist surface or crust.

Below the new snow, 20 to 50 cm of settling storm snow from earlier in the week is sitting on a weak layer of surface hoar or facets in many areas. Additional persistent weak layers are buried between 60 to 90 cm. These consist of more surface hoar and faceted grains, and/or a hard crust. These persistent layers continue to be a source of concern and have the potential for large step-down avalanches.

Weather Summary

Saturday Night

A mix of sun and cloud. 15 to 40 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Sunday

Mostly cloudy with up to 5 cm of new snow. 10 to 30 km/h northwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1000 m.

Monday

A mix of sun and cloud. 5 to 15 hm/h north ridgetop wind. Treeline temperature -3 °C. Freezing level rising to 1500 m.

Tuesday

A mix of sun and cloud. 10 to 30 hm/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level rising to 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Remote triggering is a concern; avoid terrain where triggering overhead slopes is possible.
  • Stay away from steep slopes, open slopes, and convex rolls at and below treeline where weak layers may be preserved.
  • Be especially cautious as you transition into wind-affected terrain.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.