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Avalanche Forecast

Archived

Mar 3rd, 2025–Mar 4th, 2025

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

A hard crust on the snow surface will help strengthen the snowpack, but may cause tough travel conditions.

Confidence

High

Avalanche Summary

Over the warm weekend, wet loose avalanches up to size 2 were observed. These type of avalanches have become unlikely as surfaces refreeze.

No persistent slab avalanche activity has been observed since over a week ago in the Manning area.

Snowpack Summary

Surfaces are crusty on all aspects and elevations. Below, 10 to 20 cm of snow is sandwiched between the surface and another crust.

A weak layer of facets and/or surface hoar is buried 50 to 120 cm deep. This layer has not produced avalanche activity for over a week but snowpack test results continued to show results in the Manning area.

A crust from December, buried 1 to 2 m deep, has been observed to be breaking down.

Weather Summary

Monday night

Partly cloudy. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -1°C. Freezing level 1000 m.

Tuesday

Mostly cloudy. 10 to 30 km/h south ridgetop wind. Treeline temperature 0°C. Freezing level 1500 m.

Wednesday

5 to 10 cm of snow overnight then clearing to a mix of sun and cloud. 10 to 30 km/h south ridgetop wind. Treeline temperature -1°C. Freezing level 1500 m.

Thursday

A mix of sun and cloud. 10 to 30 km/h northeast ridgetop wind. Treeline temperature 0°C. Freezing level 1700 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Triggering deep layers is more likely if the snow surface didn't freeze overnight.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

Problems

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.