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Avalanche Forecast

Archived

Jan 10th, 2024–Jan 11th, 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 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.

Regions

Glacier.

It is possible for riders to trigger fresh storm slabs. Use caution on steep, convex and unsupported terrain.

The deep freeze starts tomorrow - expect a high of -25 deg C

Confidence

Moderate

Avalanche Summary

Up to 40 cm of storm snow and moderate S/SW winds trigged a widespread natural cycle Tuesday into Wednesday morning. Avalanches, up to sz 3.0, were reaching into the runout zones and running far where a crust is present.

On Tuesday, a field team on McGill shoulder observed was able to trigger loose dry avalanches running fast in steep terrain.

This week several human triggered avalanches occurred failing at the base of the new snow, Video Peak and Forever Young.

Snowpack Summary

Moderate S/SW winds have redistributed 40-50cms of recent storm snow. Below this a sun crust is found on solar aspects; firm wind effect in the alpine; and soft facetted snow on sheltered N aspects.

Below 2100m there is a crust down 70-80cm (from Dec 5th/6th).

The Dec 1 surface hoar layer is down 90-120cm and is decomposing. However, it is still reactive in isolated snowpack tests.

Weather Summary

Cold, arctic air overtakes BC Thursday. Lingering flurries are forecast for Thursday.

Tonight: trace of snow, light W winds, low -23 °C, freezing level at valley bottom (FZL-VB)

Thurs: Mix of sun and clouds, light E winds, high -25 °C,FZL-VB

Fri: Sunny, light E winds, high -34 °C, FZL-VB

Sat: sunny, light E winds, high -24 °C, FZL-VB

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be carefull with sluffing in steep terrain, especially above cliffs and terrain traps.

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.