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Avalanche Forecast

Archived

Mar 2nd, 2024–Mar 3rd, 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.

Continue to choose low angle and supported terrain features.

Watch for strong sunshine, even brief periods can rapidly increase avalanche danger and produce natural avalanches.

Confidence

Moderate

Avalanche Summary

Periods of sunshine on Friday triggered natural avalanche activity to size 2 on Friday. Remotely triggered avalanches continued, to size 2.

Avalanches continue to occur on all aspects, within the storm snow and on buried weak layers up to 90 cm deep.

Snowpack Summary

Storm totals of 40-80 cm are beginning to settle, with wind effect in exposed, high terrain.

Multiple weak layers exist in the upper and mid snowpack. The most concerning layer is found down 40 to 100 cm with a layer of facets (or in isolated areas, preserved surface hoar) above a crust. This layer is most prevalent at treeline elevations.

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

Saturday Night

Mostly cloudy with isolated flurries. 10-25 km/h southerly wind. Freezing levels drop to valley bottom.

Sunday

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

Monday

Cloudy with sunny periods and isolated flurries. Light and variable winds. Treeline temperature -11 °C. Freezing levels at valley bottom.

Tuesday

Cloudy morning with afternoon sun. 20-40km/hr northwest winds. Treeline temperature -11 °C. Freezing levels at valley bottom.

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.