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Avalanche Forecast

Archived

Dec 24th, 2018–Dec 25th, 2018

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, 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

North Columbia.

We're into a week of stable weather, but a persistent slab problem still warrants conservative terrain choices. Read more in the new forecaster blog here.

Confidence

High - The weather pattern is stable

Weather Forecast

MONDAY NIGHT: Mostly cloudy, light wind, alpine temperatures drop to -10 C.TUESDAY: Mostly cloudy with a few sunny breaks, light wind from the northwest, alpine high temperatures around -8 C.WEDNESDAY: Mostly cloudy, light wind, alpine high temperatures around -10 C.THURSDAY: Mix of sun and cloud, light wind with moderate gusts from the northwest, alpine high temperatures around -10 C.

Avalanche Summary

A few small dry loose avalanches and wind slabs were reported in the most recent snow on Sunday. On Saturday, a few large (size 3) avalanches were triggered by explosives on south-facing alpine slopes. The avalanches released on persistent weak layers 60-150 cm deep. Otherwise, natural and human triggered activity has started to tapered off.Over the past week, several notable persistent slab avalanches have been remotely triggered from skiers on adjacent slopes, particularly in the Selkirks and the northern tip of the Monashees. The most recent occurred in the Selkirks on Friday, where a size 2.5 slab on a south slope at 2200 m was remotely triggered from low angle trees.

Snowpack Summary

10-20 cm of low density snow sits above wind slabs in the alpine, and in some isolated areas above small surface hoar (feathery crystals).A weak layer that formed during the dry spell in early December is now 80-120 cm deep. The layer is composed of weak facets, surface hoar, and a sun crust on steep south-facing slopes. This layer has been responsible for large persistent slab avalanches over the past two weeks, particularly on northeast facing slopes between 1900-2300 m and on steep south-facing slopes in the alpine.The lower snowpack is generally strong and settled, with a crust that formed in late October near the bottom of the snowpack.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.