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Avalanche Forecast

Archived

Apr 8th, 2023–Apr 9th, 2023

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

Be prepared to back off lines as snow accumulates through the day and the likelihood of avalanches increases.

Confidence

High

Avalanche Summary

Wet loose avalanches up to size 2 have been observed on all aspects and elevations. We suspect this type of activity will continue at lower elevations and slab avalanches will be more likely at treeline and above.

Snowpack Summary

The storm on Sunday will bring another 15 cm of storm snow bringing recent totals to 30-40 cm. Wind slabs will form on west through east aspects due to strong southerly winds. New storm snow  will overlie a crust at higher elevations and already moist snow at treeline.

The snowpack contains. Multiple crusts that are not currently a concern.

Weather Summary

Saturday Night

Cloudy with 5 to 10 cm of new snow expected. Strong to extreme southerly winds and freezing levels falling to 1400 m.

Sunday

Stormy with 15 cm of new snow expected. Extreme southerly winds and freezing levels rising to 1900 m with the snowline around 1200 m.

Monday

Mostly cloudy with flurries bringing up to 5cm of new snow. Moderate southerly winds and freezing levels rising to 1500 m.

Tuesday

Mostly cloudy with up to 5 cm of new snow possible. Moderate southwest winds and freezing levels rising to 1500 m.

 

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Be especially cautious as you transition into wind affected terrain.
  • The more the snow feels like a slurpy, the more likely loose wet avalanches will become.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.