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Avalanche Forecast

Archived

Apr 20th, 2025–Apr 21st, 2025

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West, Haines Pass.

Recently formed wind slabs may be reactive to human triggering.

Data is very sparse this time of year. During periods of uncertainty, a cautious approach is always recommended.

Confidence

Low

Avalanche Summary

In the Haines Pass area, this MIN post shows a recent large avalanche.

No new avalanches have been reported in the White Pass area in the past few days, but observations have been very limited.

Please consider sharing your observations if you're in the mountains this weekend.

Snowpack Summary

10-20 cm of recent snowfall was accompanied by strong southerly winds, likely forming new wind slabs on north aspects.

The upper and middle of the snowpack contain several crusts.

Check out this recent MIN report from our field team for the most recent field observations.

Weather Summary

Sunday Night

Mostly cloudy. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Monday

Cloudy with 0 to 1 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Tuesday

Cloudy with snowfall 2-4 cm. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m.

Wednesday

Mostly cloudy with flurries. 15 to 25 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.