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Avalanche Forecast

Archived

Mar 1st, 2024–Mar 2nd, 2024

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 possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
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.

Regions

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

While danger ratings are dropping and natural activity may stop, dangerous avalanche conditions still exist.

Stick to conservative terrain, avoid large slopes and overhead hazard

Confidence

Moderate

Avalanche Summary

Widespread avalanche activity was observed Thursday. Natural and human-triggered avalanches were reported within the storm snow, including several notable remotely triggered slabs to size 2.5, which indicates a very sensitive snowpack. Check out this MIN for more details.

Avalanches occurred on all aspects and on several bed surfaces - including within the storm snow and on buried weak layers up to 80 cm deep.

Snowpack Summary

40-80 cm of recent snow has been heavily wind affected in exposed terrain. Storm snow sits over wind-affected surfaces and old wind slabs in exposed areas at all elevations.

Multiple weak layers exist in the upper and mid snowpack. The most concerning layer is found down 30 to 100 cm with a layer of facets (or in isolated areas, preserved surface hoar) above a crust. The storm snow and buried weak layers have produced recent large avalanche activity. Although natural avalanche activity may taper off, human triggering remains likely.

Weather Summary

Friday Night

Clear skies with some cloud. 10-20 km/hr easterly winds. Freezing level valley bottom.

Saturday

Cloudy with possible sunny breaks and isolated flurries. 10-25 km/h southerly wind. Treeline temperature -9 °C. Freezing levels reach 500 m.

Sunday

Cloudy with sunny periods and isolated flurries. 10-20km/hr southeast winds. Treeline temperature -9 °C. Freezing levels reach 500 m.

Monday

Cloudy with sunny periods and isolated flurries. 10-20km/hr southwest winds. Treeline temperature -9 °C. Freezing levels reach 500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Brief periods of sun could quickly initiate natural avalanche activity.

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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.