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Archived

Avalanche Forecast

Apr 17th, 2025–Apr 18th, 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
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Bull, Dogtooth, East Purcell, Purcells.

Step back into conservative terrain as rising temperatures and sunshine weaken the snowpack.

Avoid overhead exposure to cornices, and steep south facing slopes in the heat of the day

Confidence

Moderate

Avalanche Summary

No new avalanches were reported Wednesday.

Recent activity has been limited to size 2 cornice falls and a few wet loose avalanches. The only notable persistent slab in the past two weeks was rider-triggered near Wasa on Apr 11.

With rapid warming expected, avalanche activity is likely to increase.

Snowpack Summary

About 5 cm of recent snow sits above a hard melt-freeze crust on northerly alpine slopes. Elsewhere, the snow surface is expected to become moist from sun and warm temperatures.

The bottom half of the snowpack is generally weak and faceted. The snowpack at lower elevations is melting rapidly.

Weather Summary

Thursday Night

Clear skies. 10 to 20 km/h northwest ridgetop wind. Freezing level drops to 500 m.

Friday

Clear skies. 10 to 30 km/h west ridgetop wind. Treeline temperature +5 °C. Freezing level 2500 m.

Saturday

Mostly cloudy with flurries. 10 to 30 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 2100 m.

Sunday

Mostly cloudy with 5 to 10 cm of snow. Light and variable wind. Treeline temperature 0 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.

Avalanche Problems

Persistent Slabs

It remains possible to trigger avalanches on buried weak layers, particularly where they are shallow in the snowpack and/or do not have a thick crust above them.

Aspects: North, North East, North West.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3

Loose Wet

Rising temperatures and strong sunshine will increase potential for wet avalanches. Warming will be most intense on steep south facing slopes, especially near rocks.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2