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Avalanche Forecast

Archived

Mar 24th, 2025–Mar 25th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
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, McBride, Sugarbowl, East Kakwa, Kakwa, McGregor, Pine Pass, Renshaw, Robson, Tumbler.

Assess conditions in your area by checking the bond of the new snow to the old.

Remember, there is still a persistent problem.

Confidence

Moderate

Avalanche Summary

On Sunday, a few dry loose avalanches were seen from steep terrain. Observations were limited though.

On Saturday, a large (size 3) natural wind slab failed on a northeast aspect in the alpine, west of Mcbride.

On Friday, a large (size 2) natural persistent slab failed on a north-facing alpine slope near Crescent Spur.

Snowpack Summary

20 to 35 cm of new snow has accumulated since Sunday, building reactive storm slabs. Sunny slopes and lower elevations will have moist or wet snow which may form into a crust overnight.

The early March crust / surface hoar persistent weak layer is down 50 to 90 cm. The greatest concern for this layer is on sheltered north and east-facing upper-elevation terrain. Another weak layer of facets or surface hoar from mid-February lies 70 to 100 cm deep. This layer appears to be strengthening and has not caused any recent avalanches. The lower snowpack remains well-settled with no layers of concern.

Weather Summary

Monday Night

Partly cloudy. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -3 °C.

Tuesday

Cloudy with 0 to 5 cm of snow. 10 to 20 km/h south ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

Wednesday

Cloudy with 5 to 10 cm of snow, possibly raining below 1500 m. 10 to 20 km/h southeast ridgetop wind. Treeline temperature 0 °C. Freezing level 1700 m.

Thursday

Cloudy with 10 to 20 cm of snow. 30 to 40 km/h east ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.
  • Make observations and continually assess conditions as you travel.

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.

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.