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Avalanche Forecast

Archived

Apr 12th, 2023–Apr 13th, 2023

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.

Continually assess conditions as you move through terrain. Rider triggerable wind slabs will still be found on lee and cross loaded features.

Confidence

Moderate

Avalanche Summary

No significant avalanches were reported on Tuesday. We suspect that rider triggerable wind slabs could still be found.

Snowpack Summary

Previous storm snow accompanied by southerly winds has likely formed wind slabs on west through east aspects at upper elevations. Up to 5 cm of new snow can be found above a crust in sheltered terrain above 1200 m. Below this elevation a thick melt-freeze crust will be found on the surface on all aspects.

A crust from late March can be found down 50 to 80 cm on all solar aspects and at treeline and below on north-facing terrain. Below this crust, the snowpack is generally well-settled.

 

Weather Summary

Wednesday Night

Mostly clear with no new snow expected. Light westerly winds and a low of -6°C at 1800 m.

Thursday

Mostly cloudy with the possibility of flurries bringing up to 5 cm of new snow. Light southwest winds and a high of -5°C at 1800 m.

Friday

Clearing skies throughout the day with the possibility of light flurries bringing trace amounts of new snow in the morning. Light variable winds and freezing levels rising to 1700 m.

Saturday

Mostly cloudy with flurries bringing up to 5 cm of new snow. Moderate to strong southerly winds and freezing levels rising to 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Minimize your exposure time below cornices.

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.