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Avalanche Forecast

Archived

Apr 3rd, 2024–Apr 4th, 2024

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

Regions

Purcells, Dogtooth, East Purcell, West Purcell.

Forecast snow may form small wind slabs on lee features below alpine ridgetops.

Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Confidence

Moderate

Avalanche Summary

A couple of naturally triggered wet slab avalanches up to size 2 were reported on sunny aspects on Tuesday.

Snowpack Summary

5 to 15 cm of forecast snow may form small wind slabs on lee features below alpine ridgetops. The new snow overlies a crust on all aspects and elevations.

A widespread crust with facets above is down 60 to 110 cm. This layer is unlikely to human trigger in areas where a thick crust above the weak layer is present.

Weather Summary

Wednesday Night

Mostly cloudy. 10 to 20 km/h east ridgetop wind. Treeline temperature -5° C. Freezing level 1100 m.

Thursday

Cloudy with isolated flurries, 5 to 15 cm. 10 to 20 km/h east ridgetop wind. Treeline temperature -3° C. Freezing level 1700 m.

Friday

Mix of sun and cloud with isolated flurries, 0 to 3 cm. 10 to 20 km/h east ridgetop wind. Treeline temperature 0° C. Freezing level 2100 m.

Saturday

Mostly cloudy with isolated flurries, 0 to 3 cm snow. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -1° C. Freezing level 2000 m.

Check out the Mountain Weather Forecast for additional weather information.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.