Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Apr 23rd, 2025–Apr 24th, 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, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.

Regions

Haines Pass.

Stormy conditions may form new slabs that could be touchy to riders.

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 slabs may form during stormy conditions on Thursday. 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

Stormy conditions will bring around 10 to 20 cm of new snow by the end of Thursday. This snow will accumulate over a layer of 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 recently produced large avalanches.

Weather Summary

Wednesday Night

Cloudy with 5 to 10 cm of snow. 30 to 50 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing level 800 m.

Thursday

Cloudy with 5 to 10 cm of snow. 40 to 50 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

Friday

Cloudy with 5 cm of snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1000 m.

Saturday

Mix of sun and cloud. 10 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • 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.