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Avalanche Forecast

Archived

Mar 10th, 2024–Mar 11th, 2024

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

Regions

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

Dangerous and challenging avalanche conditions exist. Uncertainty is best managed by choosing simple, low-angle terrain and avoiding being under steep slopes and large avalanche paths.

Confidence

Moderate

Avalanche Summary

A few remote- and rider-triggered avalanches to size 2 were reported on Saturday, crown depths averaged 50 cm and failed in the storm snow interface.

Snowpack Summary

30-50 cm of recent storm snow has accumulated with moderate to strong winds wind. Storm snow covers a variety of surfaces including surface hoar in isolated shady areas. Southwest winds have and continue to strip snow from ridgelines and exposed features and build touchy pockets in lee terrain.

Recent and older snow is settling over a crust/facet or surface hoar layer, down buried 80-140 cm. This layer continues to show sensitivity to human triggers and reactivity in snowpack testing.

The lower snowpack is well-settled and strong.

Weather Summary

Sunday night

Scattered flurries, up to 5-15 cm snow. Southwest ridgetop wind 20-40 km/hr. Treeline temperature -6 °C. Freezing level dropping below 800 m.

Monday

Cloudy with isolated flurries, trace to 10 cm snow during the day and intensifying into the evening. South ridgetop wind 20-35 km/hr with gusts to 60 km/hr. Treeline temperature -8 °C. Freezing level around 1000 m.

Tuesday

Cloudy with flurries, trace to 10 cm wet snow. Southwest ridgetop wind 20-30 km/hr. Treeline temperature -3 °C. Freezing level around 1300 m.

Wednesday

Mostly cloudy. Southwest ridgetop wind gusting to 50 km/hr. Treeline temperature -2 °C. Freezing level rising above 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.

Problems

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.

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.