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Archived

Avalanche Forecast

Apr 1st, 2025–Apr 2nd, 2025
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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.

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 and Monday explosives were used to drop cornices, some of these cornices triggered 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 variable. A crust exists on or near the surface on all aspects below treeline and on all sun exposed slopes.  On high north aspects, Up to 10 cm of snow has buried a thick melt-freeze crust from late March. Below these crusts, the upper snowpack is moist.

Several weak 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.

Tuesday Night

Mix of cloud and clear skies with 0 to 5 cm of snow. 15 to 30 km/h west ridgetop wind. Treeline temperature -8 °C.

Wednesday

Mostly cloudy with 0 to 5 cm of snow. 15 to 30 km/h west ridgetop wind. Treeline temperature -4 °C.

Thursday

Mix of sun and cloud with up to 5 cm of snow. 15 to 30 km/h north ridgetop wind. Treeline temperature -7 °C.

Friday

Sunny. 10 to 20 km/h northwest ridgetop wind . Treeline temperature -6 °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.

Avalanche Problems

Persistent Slabs

Various weak layers from the past 3 months are a concern in shallow north facing terrain. Be especially leary of slopes that match this description and have a cornice above.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3