Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Nov 27th, 2022–Nov 28th, 2022

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

Regions

Kootenay Boundary, Bonnington, Kootenay Pass, Rossland, South Okanagan, Ymir, Shuswap, North Okanagan, Whatshan.

Recent snow overlies various layers that could produce slab avalanches. A cooling trend may decrease the potential of them being triggered, but not eliminate it.

Confidence

Moderate

Avalanche Summary

A few small avalanches were observed in the south, as described in this MIN.

Looking forward, avalanche activity may decrease with a cooling trend, but the possibility of triggering the mid-November layer remains, particularly where the snowpack is smooth and uniform.

Snowpack Summary

Early season conditions exist with low snow amounts and crusts found at lower elevations and a deeper and drier snowpack approaching 1 m at treeline and alpine elevations.

Around 30 cm of snow overlies a weak layer that formed mid-November that consists of sugary faceted grains, weak surface hoar crystals in sheltered terrain features, and a hard crust on steep sun-exposed slopes.

The remainder of the snowpack is faceted as shown in this MIN, but is likely still intermixed with rocks, brush, and trees.

Weather Summary

Sunday Night

Partly cloudy with isolated flurries, accumulation 1 to 3 cm, 10 km west wind, treeline temperature -10 C.

Monday

Mix of sun and cloud with isolated flurries, accumulation 1 to 3 cm, 10 km/h northeast wind, treeline temperature -13 C.

Tuesday

Increasing cloud with isolated afternoon flurries, accumulation 1 to 3 cm, 20 km/h south wind, treeline temperature -16 C.

Wednesday

Cloudy with snowfall, accumulation 10 to 20 cm, 40 km/h south wind, treeline temperature -10 C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Closely monitor how the new snow is bonding to the old surface.
  • Early season avalanches at any elevation have the potential to be particularly dangerous due to obstacles that are exposed or just below the surface.

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.