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Avalanche Forecast

Archived

Apr 2nd, 2021–Apr 3rd, 2021

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.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast Inland.

A storm may increase avalanche danger, particularly in the north of the region. Danger will be LOW until at least ~10 cm of snow accumulates. Watch for changing conditions over the course of the day.

Confidence

Moderate - Uncertainty is due to the timing, track, & intensity of the incoming weather system.

Weather Forecast

FRIDAY NIGHT: Increasing clouds with early-morning snowfall, accumulation 1 to 3 cm, 20 km/h southwest wind, alpine temperature -7 C.

SATURDAY: Cloudy with snowfall, accumulation 5 to 15 cm in the north of the region and 2 to 10 cm in the south, 40 km/h southwest wind, alpine temperature -4 C, freezing level 1500 m.

SUNDAY: Early-morning snowfall then clearing, accumulation 5 to 10 cm, 20 km/h northwest wind, alpine temperature -5 C.

MONDAY: Clear skies, 10 km/h northwest wind, alpine temperature 0 C, freezing level rising to 2200 m.

Avalanche Summary

No new avalanches were observed on Thursday. Looking forward, avalanche activity may spike during stormy conditions on Saturday and into the night.

Snowpack Summary

A storm will bring snow above around 1500 m and strong southwest wind. The most snow is forecast for the north of the region (e.g., Duffey and Hurley) with lesser amounts in the south (e.g., Coquihalla and Manning). New wind slabs may form as the snow blows into thicker deposits at higher elevations. Storm slabs could develop in isolated areas that receive around 15 cm or greater of snow. The new snow likely overlies a hard melt-freeze crust everywhere except for on north aspects above around 1600 m. Below the rain-snow line, rain will soak an already moist snowpack.

Cornices are large and looming along ridgelines. Their release is unpredictable, requiring a large berth if you're travelling above or below them.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs are most reactive during their formation.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.