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Avalanche Forecast

Archived

Nov 21st, 2024–Nov 22nd, 2024

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

Regions

South Columbia, South Okanagan, Badshot-Battle, Goat, Gold, North Okanagan, Retallack, Valhalla, Whatshan.

Avalanche danger will increase as new snow piles up.

Choose mellow terrain while you get familiar with the snowpack, practice your rescue skills, and get your winter legs under you.

Confidence

Moderate

Avalanche Summary

On Wednesday and Thursday, a few small human triggered wind slab avalanches were reported in alpine terrain.

Looking forward, we expect that the incoming storm will make human triggered avalanches more likely.

If you are getting out in the backcountry, consider making a post on the MIN (Mountain Information Network)

Snowpack Summary

20 - 30 cm of recent snow has fallen with fairly minimal wind effect. Below 2100 m you may find a thin crust under this soft snow.

The mid and lower snowpack is generally well settled and strong.

A crust buried in early November is 50-70 cm below the surface. In some places, there are weak facets or surface hoar above this crust, but the geographical extent of this weak layer is still uncertain. Avalanches on this layer have been more frequent further north, but it will be an important interface to monitor as the recent snow settles, and more snow adds to the load.

Treeline snowpack depths are expected to be around 150 cm.

Weather Summary

Thursday Night

Partly cloudy with 2-4 cm snow expected. 15-30 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Friday

Mostly cloudy with 4-8 cm of snow expected. 15-45 km/h southeast ridgetop wind, highest speeds in the afternoon. Treeline temperature -2 °C.

Saturday

Cloudy with 2-8 cm of snow expected. 10-20 km/h southwest ridgetop wind. Treeline temperature - 5 °C.

Sunday

Mostly cloudy with 2-6 cm of snow expected. 10-20 km/h southwest ridgetop wind. Treeline temperature -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Start with conservative terrain and watch for signs of instability.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent 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.