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Avalanche Forecast

Archived

Nov 25th, 2022–Nov 26th, 2022

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

Harrison-Fraser.

Reactive slabs will first form in wind-loaded areas as new snow accumulates and the wind intensifies through the day.

Confidence

Moderate

Avalanche Summary

No new avalanches have been observed or reported in the region. Observations are limited at this time of year, if you head into the backcountry consider submitting a MIN report.

Snowpack Summary

On Friday winds 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 at low elevations. Below this drought layer, several other facet-crust interfaces exist in the snowpack.

Typical snow depth ranges from 50-100 cm in the alpine and 40-60 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 10 cm accumulating by 4 pm Saturday as south-southwesterly winds increase to strong. Alpine high -4 C. Freezing level 1100 m.

Sunday

Snowfall and extreme winds are expected overnight, with up to 25 cm of new snow by morning. Convective flurries may continue through the day. West wind decreasing to moderate, 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 -20 C, and freezing level valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Seek out sheltered terrain where new snow hasn't been wind-affected.
  • Wind slabs are most reactive during their formation.

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.