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Archived

Avalanche Forecast

Mar 27th, 2025–Mar 28th, 2025
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Dogtooth, East Purcell, Purcells.

There is uncertainty with the speed of recovery of the snowpack. Maintain conservative terrain choices.

Confidence

Moderate

Avalanche Summary

A widespread, large, destructive avalanche cycle occurred across the region, involving persistent, and deep persistent slab avalanches. Wet loose and wet slab activity has been widespread throughout the region.

Read the Forecaster Blog for an opportunity to reflect on this week's widespread avalanche activity.

Snowpack Summary

A dusting of new snow will bury a variety of surfaces, including moist snow and crusts. Below lies a complex snowpack with several weak layers:

  • Where intact, an interface from early March, 30 to 50 cm deep, consists of a crust on sunny slopes and lower elevations, and surface hoar or facets in sheltered, shaded upper elevations.

  • Persistent weak layers from February and January, including crusts, facets, and surface hoar, are buried 50 to 100 cm deep and remain a concern.

  • The bottom of the snowpack is composed of large facets.

Weather Summary

Thursday Night

Mostly cloudy, isolated flurries, 1 to 2 cm. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

Friday

Mostly cloudy, scattered flurries, 1 to 2 cm. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 2000 m.

Saturday

Mostly cloudy, scattered flurries 3 to 5 cm. 10 to 15 km/h southwest wind. Treeline temperature 0 °C. Freezing level 2000 m.

Sunday

Partly cloudy, isolated flurries, 1 to 2 cm. 5 to 10 km/h southwest ridgetop wind. Treeline temperatures -2 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • In times of uncertainty, conservative terrain choices are our best defense.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.

Avalanche Problems

Persistent Slabs

Several buried weak layers exist throughout the snowpack. These layers remain active while the snowpack adjusts to the most recent stress.

Aspects: North, North East, East, West, North West.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3

Deep Persistent Slabs

Weak layers near the bottom of the snowpack continue to be a concern. Avalanches on these layers will be large, destructive, and may run full path.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2.5 - 3.5