Avalanche Forecast

Issued: Jan 27th, 2024 4:00PM

The alpine rating is high, the treeline rating is high, and the below treeline rating is below threshold. Known problems include Storm Slabs.

Avalanche Canada mhalik, Avalanche Canada


Travel in avalanche terrain is not recommended today.Heavy snow/rain, extreme wind and warm temperatures have made an unstable snowpack, with potential for widespread large avalanches.




Avalanche Summary

A large (size 2) naturally-triggered avalanche was observed along the highway corridor between White Pass and Skagway on Saturday.

We suspect a widespread natural avalanche cycle is ongoing across the region.

Snowpack Summary

Around 25 cm of storm snow fell overnight Friday, and a further 10-30 cm of snow or rain is set to fall by the end of the day Sunday. With forecast strong to extreme alpine winds this new snow will form reactive storm slabs, especially on lee north and east slopes.

The field team has found a buried weak layer of surface hoar and facets 45-70 cm below the surface. While triggering this layer is unlikely, there is potential for smaller avalanches to overload this layer triggering a larger step-down avalanche.

The overall midpack is generally settled and strong, with the average snowpack depth at treeline around 160 cm.

Weather Summary

Saturday Night

Cloudy with 10-20 cm of new snow/moderate to heavy rain, south alpine wind 70 km/h, treeline temperature -1°C, freezing levels rising to 1000 m


Cloudy with 10-20 cm of new snow/moderate to heavy rain, south alpine wind 60 km/h, treeline temperature 0°C, freezing levels 1000 m.


Cloudy with 15-25 cm of new snow / moderate to heavy rain, southeast alpine wind 80-90 km/h, treeline temperature 1°C, freezing level 1500 m.


Cloudy with 5-15 cm of new snow, south alpine wind 40-50 km/h, treeline temperature -4°C and freezing levels dropping back to 400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use increased caution at all elevations. Storm snow is forming touchy slabs.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.


Storm Slabs

An icon showing Storm Slabs

Storm slabs have built up throughout the storm and are primed to be very reactive to natural and human triggers.

Aspects: All aspects.

Elevations: Alpine, Treeline.


Very Likely

Expected Size

1 - 2.5

Valid until: Jan 28th, 2024 4:00PM