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Archived

Avalanche Forecast

Jan 15th, 2025–Jan 16th, 2025
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Dogtooth, East Purcell, Purcells, West Purcell.

Wind slab releases remain a concern in the alpine, continue to assess as you travel. Steep, rocky, shallow terrain are the most likely trigger areas for the persistent weak layer.

Confidence

Moderate

Avalanche Summary

Wind slab avalanche activity continues to be reported in the region. Reports have identified them to be more reactive where they overlie a surface hoar layer. Check out this MIN for more information on wind slab activity in the Jumbo Pass area.

Snowpack Summary

Roughly 2 to 4 cm of new snow has buried various surfaces of sun-crust, surface hoar, and wind-affected snow. Wind slabs can still be found in lee features over a surface hoar layer.

A weak layer of facets buried in early December is on average 60 to 90 cm deep. In the shallower eastern parts of the Purcells, this layer is closer to 30 cm deep. This layer continues to cause occasional large avalanches.

The snowpack base consists of a thick crust and facets in many areas.

Weather Summary

Wednesday Night

Partly cloudy. 20 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Thursday

Partly cloudy. Isolated flurries, 2 to 4 cm. 20 to 30 km/h west ridgetop wind. Treeline temperature -10 °C.

Friday

Partly cloudy. Isolated flurries,2 to 4 cm. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -11 °C.

Saturday

Mix of sun and cloud. 10 km/h northwest ridgetop wind. Treeline temperature -16 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Pay attention to isolated wind affected features in the alpine, as well as cross-loaded features at treeline.

Avalanche Problems

Wind Slabs

Wind slabs formed on the weekend are becoming more difficult to trigger but may be reactive where they overlie surface hoar or a melt-freeze crust.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Persistent Slabs

The early December weak layer remains a concern in areas with a shallow snowpack, particularly on steep rocky slopes.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 2.5