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Avalanche Forecast

Archived

Mar 27th, 2024–Mar 28th, 2024

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

Regions

South Coast Inland, Birkenhead, Duffey, South Chilcotin, Stein, Taseko.

Human-triggered persistent slab avalanches remain a concern on north-facing alpine slopes.

Confidence

Moderate

Avalanche Summary

One small (size 1) wind slab avalanche was human-triggered on Tuesday.

While there has been minimal avalanche activity over the past week, professionals in the region are still weary of the persistent slab problem.

Snowpack Summary

A dusting of snow has accumulated over a widespread crust, resulting in a mix of soft and hard surfaces.

A significant crust/facet layer is buried 80 to 150 cm deep. It was very reactive to human triggering during the first half of March and still produces concerning snowpack test results. It has become a low-probability high-consequence problem on northerly aspects above 2000 m.

Weather Summary

Wednesday Night

Cloudy with 1 to 2 cm of snow. 15 km/h south ridgetop wind. Treeline temperature -6 °C.

Thursday

A mix of sun and cloud with isolated flurries. 10 km/h south ridgetop wind. Treeline temperature -3 °C. Freezing level 1500 m.

Friday

A mix of sun and cloud with isolated flurries. 5 km/h north ridgetop wind. Treeline temperature -3 °C. Freezing level 1500 m.

Saturday

Mostly sunny. 15 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Use caution on large alpine slopes, especially around thin areas that may propagate to deeper instabilities.
  • Conditions may have improved, but be mindful that deep instabilities are still present.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.