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Avalanche Forecast

Archived

Mar 28th, 2024–Mar 29th, 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 possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

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

While the best riding conditions may be found on north facing, alpine slopes - persistent weak layers may still be reactive here.

Choose smaller, low angle slopes to reduce your exposure.

Confidence

Moderate

Avalanche Summary

Last reported activity was a human triggered size 1 wind slab avalanche 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

Up to 10 cm of recent snow can be found over a widespread crust, resulting in a mix of soft and hard surfaces. South/southwest winds have redistributed this snow into wind slabs around ridgelines on north facing slopes at treeline and above.

A significant crust/facet layer is buried 80-150 cm deep. This layer produced very large natural and human triggered avalanches in early March. While no recent avalanche activity has been observed on this layer, it continues to produce concerning snowpack test results. It has become a low-probability high-consequence problem on north-facing slopes above 2000 m.

Weather Summary

Thursday Night

Mostly cloudy with isolated flurries. Light and variable ridgetop wind. Freezing level drops to around 800 m.

Friday

A mix of sun and cloud with isolated flurries possible. 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.

Sunday

Mostly sunny. 15 km/h west ridgetop wind with strong gusts. Freezing level rises to 2500 m in the afternoon, bringing treeline temperatures to +8 °C.

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.