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Avalanche Forecast

Archived

Mar 31st, 2025–Apr 1st, 2025

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

Regions

Purcells, Dogtooth, East Purcell, West Purcell.

Persistent slabs are possible to trigger in areas where the snowpack transitions from thick to thin or by a falling cornice

Evaluate terrain and reduce your time travelling below cornices

Confidence

Moderate

Avalanche Summary

On Sunday explosives were used to drop cornices, some of these cornices triggered deep persistent slabs on the slopes below. The resulting avalanches  were up to size 3 with crowns as deep as 3 meters.

Snowpack Summary

The upper  snowpack is highly variable. A crust exists on or near the surface on all aspects below treeline and on all sun exposed slopes.  On north aspects, Up to 10 cm of snow has buried a melt-freeze crust from late March that increases in thickness  as you gain elevation. Below these crusts, the upper snowpack is moist.

Several week layers from early March, mid February and late January can be found in the mid and lower snowpack.

The base of the snowpack is generally faceted.

Weather Summary

Precipitation amounts over the next 24hrs could be highly variable due to convection.

Monday Night

Mix of cloud and clear skies with 0 to 3 cm of snow. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -7 °C.

Tuesday

Mostly cloudy with 1 to 5 cm of snow. 10 to 20 km/h west ridgetop wind. Treeline temperature -4 °C.

Wednesday

Mostly cloudy with up to 10 cm of snow. 15 to 30 km/h west ridgetop wind.  Treeline temperature -5 °C.

Thursday

Mix of sun and cloud with up to 10 cm of snow. 10 to 20 km/h northeast ridgetop wind. Treeline temperature -7 °C.

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.
  • Avoid areas with a thin or variable snowpack.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

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.