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Avalanche Forecast

Archived

Apr 24th, 2025–Apr 25th, 2025

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

Haines Pass.

Around 10 to 20 cm of snow may overly various weak layers. Assess for slab formation and use particular caution in any consequential terrain.

Confidence

Moderate

Avalanche Summary

We haven't received recent reports of avalanche activity.

Last weekend, the reports here and here describe recent large avalanches that released on buried weak layers on northerly alpine terrain.

Looking forward, we suspect that slabs forming over surface hoar crystals on northerly aspects could be reactive to human traffic. It also remains possible to trigger large avalanches on northerly alpine terrain.

Please share your observations to the MIN!

Snowpack Summary

Around 10 to 20 cm of recent snow overlies surface hoar crystals on shaded aspects and a melt-freeze crust at lower elevations and on sun-exposed slopes. Recent strong wind may have formed 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 recently produced large avalanches.

Weather Summary

Thursday Night

Cloudy with 1 to 3 cm of snow. 30 to 40 km/h southeast ridgetop wind. Treeline temperature -4 °C. Freezing level 500 m.

Friday

Cloudy with 1 to 3 cm of snow. 10 to 20 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 700 m.

Saturday

A mix of sun and clouds. 10 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1100 m.

Sunday

Cloudy with 1 to 3 cm of snow. 20 km/h southeast ridgetop wind. Treeline temperature 0 °C. Freezing level 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Make observations and continually assess conditions as you travel.
  • Cornice failures could trigger large and destructive avalanches.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.