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Avalanche Forecast

Archived

Mar 30th, 2025–Mar 31st, 2025

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

Regions

Purcells, Dogtooth, East Purcell, West Purcell.

Cooling temperatures are reducing the likelihood of triggering large persistent slab avalanches.

Avoid steep or convex terrain features with a shallow, rocky snowpack.

Confidence

Moderate

Avalanche Summary

A cornice fall triggered a large size 2.5 avalanche that released to the ground near Kimberly on Saturday.

Snowpack Summary

Recent snow buries a surface crust that varies in thickness and supportiveness.

Depending on elevation, Refrozen and moist snow can be found in the upper snowpack.

Below this, weak layers of facets and crusts remain a concern for human-triggering where a supportive melt-freeze crust has not yet formed or breaks down during the day with rising freezing levels and periods of sun.

Weather Summary

Sunday Night

Increasing clouds. 10 to 15 km/h southeast ridgetop wind. Treeline temperature -3 °C.

Monday

Cloudy, isolated flurries, 1 to 2 cm. 10 to 15 km/h east ridgetop wind. Treeline temperature 0 °C. Freezing levels 1700 m.

Tuesday

Cloudy, flurries, 2 to 4 cm. 15 to 20 km/h northwest ridgetop wind. Treeline temperature -3 °C. Freezing level 2000 m.

Wednesday

Partly cloudy, isolated flurries, 1 to 2 cm. 20 to 30 km/h ridgetop wind. Treeline temperature -3 °C. Freezing level 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep in mind that human triggering may persist as natural avalanches taper off.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

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.