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Avalanche Forecast

Archived

Apr 22nd, 2025–Apr 23rd, 2025

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

Regions

Purcells, Dogtooth, East Purcell, West Purcell.

Small wind slabs may linger in isolated locations below alpine ridgetops.

Confidence

Moderate

Avalanche Summary

On Monday, several skier triggered size 1 wind slabs were reported on lee aspects in the alpine.

NOTE: Observations are currently very limited in this region.

Snowpack Summary

Up to 20 cm of recent snow may be found at upper elevations. This snow overlies a robust crust everywhere except northerly aspects at upper elevations. Recent westerly wind may have formed small wind slabs on lee aspects at upper elevations.

While weak layers at the bottom or middle of the snowpack have been a concern throughout the season, the current lack of avalanche activity and benign weather suggest they are not a concern at this time. They could become problematic again this spring whenever temperatures rise significantly.

Weather Summary

Tuesday Night

Clear skies. 5 to 10 km/h northwest ridgetop wind. Treeline temperature -4 °C. Freezing level valley bottom.

Wednesday

Mix of sun and cloud. 5 to 10 km/h northwest ridgetop wind. Treeline temperature 1 °C. Freezing level 2200 m.

Thursday

Sunny. 5 to 10 km/h southeast ridgetop wind. Treeline temperature 4 °C. Freezing level 2600 m.

Friday

Sunny. 5 to 10 km/h southeast ridgetop wind. Treeline temperature 5 °C. Freezing level 2700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate big and steep terrain features before committing to them.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.