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Avalanche Forecast

Archived

Mar 8th, 2025–Mar 9th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Coquihalla, Manning, Skagit.

New snow and strong winds will continue to build thick storm slabs on Sunday.

Careful snowpack evaluation, cautious route-finding, and conservative decision-making are essential.

Confidence

Low

Avalanche Summary

No new avalanches were reported on Saturday by 4 pm.

As storm snow accumulates on Sunday, we anticipate an increase in avalanche activity throughout the day as storm slabs grow deeper and become more reactive.

If you are headed to the backcountry, please consider sharing your photos and observations from your day on the Mountain Information Network.

Snowpack Summary

By Sunday morning, storm snow totals are expected to be up to 20 cm, with an additional 15 to 30 cm of snow expected through the day. Storm snow covers a crust on all aspects except on high north-facing terrain, where new snow buries up to 20 cm of snow overlying a crust from earlier in March.

A layer of facets and surface hoar from late January can be found down 50 to 120 cm.

The lower snowpack contains several crusts that are not concerning.

Weather Summary

Saturday Night

Cloudy with flurries, 5 to 20 cm of snow. 40 to 50 km/h south ridgetop wind. Treeline temperature -2 °C. Freezing level 1500 m.

Sunday

Cloudy with flurries, 15 to 30 cm of snow. 30 to 50 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level dropping through the day to 1000 m.

Flurries will continue overnight, 10 to 15 cm of snow.

Monday

Partly cloudy with light flurries, 2 to 4 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level around 1000 m.

Tuesday

Partly cloudy with light flurries, 2 to 5 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level around 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Dial back your terrain choices if you are seeing more than 30 cm of new snow.
  • Avoid freshly wind-loaded terrain features.
  • Storm slabs in motion may step down to deeper layers resulting in large 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.