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Avalanche Forecast

Archived

Apr 7th, 2023–Apr 8th, 2023

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Another storm will impact the South Coast ranges Saturday and could extend into this region.

Dial back your terrain choices if there is more than 25 cm of recent snow where you are riding.

Confidence

Moderate

Avalanche Summary

Wet loose avalanches (up to size 1.5) were reported at all aspects and all elevations with warm weather on Thursday in the region.

If you head out in the backcountry, let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

Up to 10 cm of heavy wet snow can be found at upper elevations. Moist snow or crusty surface formed up to 1800 m on all aspects due to elevated freezing levels Thursday. This overlies on a variety of surfaces, including melt-freeze crust on southerly aspects, wind-affected snow on open slopes and leeward features. Snow at low elevations is rapidly melting out. The mid and lower snowpack consists of several old crusts and facetted snow that continue to be monitored, particularly in shallow snowpack areas.

Weather Summary

Wet, warm & windy conditions are expected to impact the region as two more storms will roll into the South Coast ranges Saturday and Sunday.

Friday night

Cloudy. Isolated flurries up to 5-10 cm. Moderate southwest wind gusting 50 km/h. Alpine low -3 °C. Freezing level lowers to 1200 m.

Saturday

Snow. 10-15 cm. Moderate southwest wind gusting 50 km/h. Alpine high -3 °C. Freezing level steady at 1300 m.

Sunday

Rain 20-30 mm. Heavy snow at upper elevations only. Strong southwest wind gusting 50 km/h. Alpine high -1 °C. Freezing level steady around 1800 m.

Monday

Cloudy. Isolated flurries up to 5 cm. Moderate southwest wind gusting 40 km/h. Alpine low -3 °C. Freezing level lowers to 1200 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Investigate the bond of the recent snow
  • Be especially cautious as you transition into wind affected terrain.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • The more the snow feels like a slurpy, the more likely loose wet avalanches will become.

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.

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.