Bulletin d’avalanche

Kootenay Boundary

Dec 23 – 24, 2014Avalanche Canada
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Danger d’avalanche

Thu
Fri
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Points saillants

Avalanches are expected to be easily triggered during and after the storm on Wednesday.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–5
    New snow and wind will add additional load to a highly reactive weak layer. Avalanches may be triggered naturally or by light loads from human triggers.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    An avalanche on Sunday stepped down to deeply buried weak layers which formed in November. These destructive layers should remain on our radar as they could be triggered with large inputs such as a cornice fall or an avalanche in motion.

Confidence

Fair - Forecast snowfall amounts are uncertain on Wednesday

Weather Forecast

20-30 cm new snow is expected to fall overnight Tuesday and through Wednesday. Ridgetop winds around 60 km/h from the SW overnight Tuesday should become northwest 30-40 by midday Wednesday. Freezing levels are expected to be around 1300 m on Wednesday. On Thursday, lingering flurries are possible, with generally light west or northwest winds and freezing levels at valley bottom. On Friday, conditions should be dry with some clear spells. Northwest winds may pick up in speed as colder weather descends from the north.

Avalanche Summary

Widespread natural and remotely triggered storm slab avalanches to size 2.5 were reported from across this region on Sunday. They occurred on a variety of aspects and elevations between 1700 and 2200 m. The recently buried crust/surface hoar interface was the culprit in most of these avalanches, although in one event near Rossland, a remotely triggered storm slab in motion stepped down to the November crust/facet interface near the ground on a planar slope at 2100m. On Monday, a skier-triggered an avalanche remotely from 10 m away on an east aspect at 2050 m, while avalanche control produced avalanches up to size 2.5 on the recent rain crust.

Snowpack Summary

Up to 50 cm of recent storm snow overlies a prominent surface hoar layer above a thick rain crust that extends as high as 2400 m. This crust/surface hoar interface was very reactive during the storm over the weekend, and still has the potential to produce further avalanches with additional load from new snow or wind, or in response to human triggers. High elevation north aspect slopes do not have the rain crust, but are still reported to have buried touchy surface hoar. On these slopes, deeper facets or buried surface hoar from earlier in the month may also be lurking. At the base of the snowpack, a crust/facet combo has become less likely to trigger, although a recent avalanche that occurred on this layer near Rossland indicates this layer should remain on our radar on steep, smooth terrain at treeline and in the alpine.

Régions couvertes