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Avalanche Forecast

Archived

Apr 17th, 2023–Apr 18th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Assess for how the new snow is bonding to the snowpack before committing to high consequence terrain.

Confidence

Moderate

Avalanche Summary

Several small wet loose avalanches were observed in the region over past few days. Looking forward, a cooling trend with some new snow may form small storm slabs that could be triggered by riders.

Snowpack Summary

Around 5 to 15 cm of new snow is expected above 1100 m by the end of Tuesday. This snow will build on a consolidated snowpack composed of hard snow and bonded melt-freeze crusts. Cornices are very large along alpine ridges.

Weather Summary

Monday Night

Cloudy with snowfall, accumulation 2 to 5 cm with local enhancements possible, 20 km/h southwest wind, treeline temperature -7 °C.

Tuesday

Mostly cloudy with intermittent snowfall, accumulation 2 to 5 cm with local enhancements possible, 20 to 30 km/h southwest wind, treeline temperature -6 °C, freezing level 1100 m.

Wednesday

Mix of sun and cloud with no precipitation, 10 km/h southwest wind, treeline temperature -4 °C, freezing level 1400 m.

Thursday

Cloudy with light snowfall, accumulation 1 to 3 cm, 10 km/h southwest wind, treeline temperature -5 °C, freezing level 1300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Minimize your exposure time below cornices.
  • Be alert to conditions that change with aspect and elevation.

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.