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Avalanche Forecast

Archived

Apr 2nd, 2024–Apr 3rd, 2024

Alpine
Natural avalanches possible, human triggered probable.
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

Sasquatch, Sasquatch, Coquihalla, Harrison-Fraser, Manning, Skagit.

Fresh, reactive wind slabs will likely form at upper elevations with strong winds.

As rain will be turning into snow, total snowfall amounts are uncertain.

Confidence

Moderate

Avalanche Summary

Evidence of a natural avalanche cycle from the past weekend may still be visible. The likelihood of avalanches will increase with ongoing strong winds and rain turning into snow on Tuesday night.

Snowpack Summary

New snow will accumulate over moist snow at lower elevations or a crust on all aspects, except north-facing alpine slopes where dry snow can still be found. The mid and lower snowpack are generally well-bonded.

Weather Summary

Tuesday Night

Cloudy with 10 to 20 cm of new snow expected. Ridgetop winds southwest, 40 to 60 km/h. Treeline temperature -5 °C. Freezing level dropping to 800 m.

Wednesday

Cloudy with sunny periods and isolated convective flurries. Ridgetop winds southwest, 20 to 40 km/h. Treeline temperature -1 °C. Freezing level rising to 1200 m.

Thursday

Cloudy with sunny periods. Ridgetop winds northeast, 20 to 30 km/h. Treeline temperature rising to 0 °C. Freezing level rising to 1500 m.

Friday

A mix of sun and cloud. Ridgetop winds northeast, 20 to 30 km/h. Treeline temperature rising to +2 °C. Freezing level rising to 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Recent new snow may be hiding windslabs that were easily visible before the snow fell.
  • Closely monitor how the new snow is bonding to the old surface.

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.