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Avalanche Forecast

Archived

Mar 17th, 2022–Mar 18th, 2022

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, 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

Vancouver Island.

In parts of the region that saw more than around 10 cm of new snow on Thursday, watch for newly formed wind slabs in exposed high elevation terrain. 

Confidence

Moderate - Uncertainty is due to the limited number of field observations. Forecast snowfall amounts are uncertain.

Weather Forecast

The next storm system is expected to reach the region on Friday afternoon bringing snowfall for Friday night into Saturday morning. 

Thursday night: Mainly cloudy, light to moderate SW wind, freezing level around 1000 m. 

Friday: Snowfall beginning in the afternoon 5-10 cm, moderate to strong SW wind, freezing level reaching around 1200 m. 

Friday night: Snowfall 5-15 cm, strong S wind, freezing level around 1000 m. 

Saturday: Lingering flurries in the morning up to 5 cm, sunny breaks in the afternoon, moderate SW wind, freezing level around 800 m. 

Sunday: A mix of sun and cloud, light to moderate SW wind, freezing level around 800 m. 

Avalanche Summary

No new avalanche observations have been reported recently. 

Snowpack Summary

Prior to Thursday's snowfall, 15-20 cm of older storm snow had been redistributed by wind at upper elevations forming wind slabs that have now settled and stabilized, bonding well to a widespread melt-freeze crust found across the region. This underlying crust is thickest at low elevations and on sun-exposed slopes, and may not exist on high elevation north aspects. The snowpack is considered strong and well-bonded below this crust. Check out the recent MIN post from the Avalanche Canada field team for more details from the north of the region. 

Below treeline, snowpack depths are below threshold for avalanches in many areas.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Be alert to conditions that change with elevation and wind exposure.

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.