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Avalanche Forecast

Archived

Mar 24th, 2026–Mar 25th, 2026

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

Regions

South Rockies, Dogtooth, East Purcell, Bull, Elkford East, Elkford West.

Freshly formed storm slabs will be most reactive in wind affected terrain.

Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.

Confidence

Moderate

  • We are uncertain about forecast snowfall amounts.
  • We are uncertain about how quickly persistent slabs are gaining strength.

Avalanche Summary

No new avalanches were reported on Monday.

Last week's rain and warm temperatures triggered a widespread natural slab avalanche cycle up to size 3.5.

If you are heading into the backcountry, please consider sharing conditions via the MIN.

Snowpack Summary

Forecast 15 to 25 cm of new snow and strong southwest winds may form storm slabs that will be most reactive in wind affected terrain.

New snow sits over a melt-freeze crust to 2100 m in the north, rising to the mountain top in the south.

Below this, 30 to 50 cm of moist snow sits above a crust (1 to 10 cm thick). Various persistent weak layers may still exist in the top 120 cm of the snowpack. These may remain possible to trigger at upper elevations in areas where the crust above the weak layer is thin.

In shallow snowpack areas, depth hoar (large facets) can be found near the bottom of the snowpack.

Weather Summary

Tuesday Night
Cloudy. 3 to 15 cm of snow. 70 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1900 m.

Wednesday
Mostly cloudy. 0 to 5 cm of snow. 50 km/h west ridgetop wind. Treeline temperature -6 °C. Freezing level 1700 m.

Thursday
Mostly cloudy. 40 km/h west ridgetop wind. Treeline temperature -9 °C. Freezing level valley bottom, rising to 1000 m.

Friday
Sunny. 40 km/h west ridgetop wind. Treeline temperature -8 °C. Freezing level valley bottom, rising to 1600 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
  • Be especially cautious as you transition into wind-affected terrain.
  • Storm slabs in motion may step down to deeply buried weak layers and result in very large avalanches.
  • Cornice failures could trigger large and destructive avalanches.
  • Use small, low consequence slopes to test the bond of the new snow.

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.