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Archived

Avalanche Forecast

Apr 22nd, 2025–Apr 23rd, 2025
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
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
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Haines Pass.

New slabs may form with snow and strong wind. It also remains possible to trigger large avalanches failing on buried weak layers in northerly alpine terrain.

Confidence

Moderate

Avalanche Summary

We've received a few reports of some recent large avalanches that likely released on buried weak layers (here and here). Most of the avalanches released on northerly alpine terrain.

Looking forward, new small avalanches may form from new snow that rests on surface hoar crystals. It will also remain possible to trigger large avalanches on northerly alpine terrain.

Please continue to share your observations via the Mountain Information Network. Thank you!

Snowpack Summary

5 to 10 cm of new snow will fall onto surface hoar crystals on shaded aspects and a melt-freeze crust at lower elevations and on sun-exposed slopes. Strong wind may form deeper deposits in lee terrain features.

We have limited snowpack information, but this report suggests a generally weak lower snowpack with various potential layers of concern, which produced recent large avalanches.

Weather Summary

Tuesday Night

Cloudy with 1 to 3 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -3 °C.

Wednesday

Cloudy with 5 cm of snow. 40 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

Thursday

Cloudy with 5 to 10 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

Friday

Mostly cloudy with 2 to 5 cm of snow. 20 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for signs of slab formation throughout the day.
  • Make observations and continually assess conditions as you travel.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.

Avalanche Problems

Wind Slabs

New slabs may form with new snow and strong wind. These slabs will be particularly touchy where they rest on weak surface hoar crystals.

Aspects: North, North East, East, West, North West.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

Recent large avalanches released on buried weak layers in northerly alpine terrain. Similar avalanches could be triggered in the coming days.

Aspects: North, North East, East, West, North West.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3