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Avalanche Forecast

Archived

Jan 14th, 2025–Jan 15th, 2025

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

Regions

Northwest Coastal, Boundary, Stewart, Ningunsaw, Ningunsaw, Ningunsaw.

Another 30 cm and strong wind are driving the avalanche danger. Travel in avalanche terrain is not recommended.

Deep instabilities are present and have produced recent large avalanches.

Confidence

Moderate

Avalanche Summary

On Monday, numerous naturally triggered slab avalanches (up to size 3) were reported.

Skiers have also reported widespread whumpfing and shooting cracks. As well as remote-triggering wind slabs.

Natural avalanche activity is expected on Wednesday and avalanche terrain should be avoided.

Snowpack Summary

Another 30 + cm is expected Wednesday bringing storm snow totals up to 80 cm over the past few days. Strong to extreme west through southwest wind has created widespread wind effect, with deeper deposits of snow on leeward slopes.

Down 70 to 120 cm a layer of surface hoar, facets, or a thin crust exists.

A persistent weak layer of surface hoar and facets overlying a crust is buried 120 to 150 cm deep. This layer remains reactive, producing large and dangerous avalanches.

Weather Summary

Tuesday Night

Snow 10 cm. 30 to 45 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 700 m.

Wednesday

Snow up to 30 to 40 cm. 45 to 90 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1200 m.

Thursday

Mix of sun and cloud, possible flurries up to 5 cm. 25 to 90 km/h south ridgetop wind. Treeline temperature -5 °C. Freezing level valley bottom.

Friday

Cloudy with sunny periods. 10 to 30 km/h northwest ridgetop wind. Treeline temperature -7 °C. Freezing level valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Travel in alpine terrain is not recommended.
  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.

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.