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Avalanche Forecast

Archived

Mar 6th, 2025–Mar 7th, 2025

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Assess terrain carefully and practice good group management

The best riding may be on the same features where triggering an avalanche is most likely

Confidence

Moderate

Avalanche Summary

We have not received reports of slab avalanches since last week but observations in this region are limited.

Snowpack Summary

A new crust likely exists on the surface except on high north facing terrain, where up to 20 cm of snow overlies 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 contain several crusts that are not concerning.

Weather Summary

Thursday Night

Increasing cloud. 10 to 20 km/h west ridgetop wind. Treeline temperature -3 °C.

Friday

Mix of sun and cloud. 20 to 50 km/h southwest ridgetop wind. Treeline temperature -2 °C.

Saturday

Mostly cloudy with 5 to 15 mm of mixed precipitation. 30 to 50 km/h southwest ridgetop wind. Freezing level rising to 1700 m.

Sunday

Cloudy with up to 5 mm of mixed precipitation. 40 to 70 km/h south ridgetop wind. Freezing level rising to 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful as you transition into wind-affected terrain.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.