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Avalanche Forecast

Archived

Nov 25th, 2022–Nov 26th, 2022

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

Regions

Brandywine.

Snowfall accumulation and wind will intensify throughout the day. Expect to find increasingly reactive slabs in wind-loaded areas and plan to get home before the storm really hits.

Confidence

Moderate

Avalanche Summary

On Thursday, a small wind slab was triggered by a skier on a northeast ridge feature, explosives work on cornices triggered small (size 1) slabs on the slopes below, and wet loose avalanches were observed in steep rocky terrain below 1900 m.

On Wednesday, explosive control work in the Whistler area produced several storm slab avalanches up to size 2 in the alpine and upper treeline. These avalanches occurred in wind-loaded terrain.

Looking forward, we expect slabs to become increasingly reactive as snowfall accumulates, first in wind-loaded areas and then becoming widespread by Sunday morning.

Snowpack Summary

On Friday wind and warm temperatures quickly impacted up to 15 cm fresh snow. Accumulation totals quickly tapered with elevation.

A weak drought layer is down 20-50 cm. This layer consists of hard, wind-affected snow in the alpine, surface hoar or facetted snow in sheltered areas, and a crust on solar aspects and on all aspects below 2200m. Below this layer, several other facet-crust interfaces exist in the snowpack.

Typical snow depth ranges from 80-150 cm in the alpine and 50-70 cm at treeline. Expect early season conditions and rugged travel. Below treeline is below the threshold for avalanches.

Weather Summary

Friday night

Cloudy with isolated flurries, trace accumulation. Light west wind increasing overnight, treeline temperatures below -5 C, freezing level dropping below 1000 m.

Saturday

Snowfall and wind will intensify throughout the day. Up to 15 cm accumulating by 4 pm Saturday as southwesterly winds increase into extreme. Alpine high -4 C. Freezing level around 1200 m.

Sunday

Heavy snowfall and extreme winds are expected overnight, with up to 35 cm of new snow by morning. Convective flurries may continue through the day. West wind decreasing to moderate through the day, treeline temperatures dropping to -10 C, and freezing level dropping to valley bottom.

Monday

Cold with a mix of sun and cloud. Light to moderate southerly wind, treeline lows down to -18 C, and freezing level valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm snow and wind is forming touchy slabs. Use caution in lee areas in the alpine and treeline.
  • Dial back your terrain choices if you are seeing more than 25cm of new snow.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.