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North Columbia

Les prévisions d'avalanches ne sont pas complètement traduites.

Vous pouvez consulter ces prévisions d'avalanches en:

Incoming weather is not conducive to natural avalanche activity, but human-triggered avalanches are possible. Uncertainty remains about this difficult-to-forecast deep persistent slab problem.

Indices de danger

Alpin
2 - Modéré
Limite forestière
2 - Modéré
Sous la limite forestière
1 - Faible
Alpin
2 - Modéré
Limite forestière
2 - Modéré
Sous la limite forestière
1 - Faible
Alpin
2 - Modéré
Limite forestière
2 - Modéré
Sous la limite forestière
1 - Faible

Conseils sur le terrain et les déplacements

  • Méfiez-vous des plaques à vent, surtout sur les pentes raides, sans appui aval et/ou convexes.
  • Si elles se déclenchent, les avalanches de plaque à vent pourraient entraîner les couches sous-jacentes, causant des avalanches plus importantes.
  • Évitez les zones où le manteau neigeux est mince, comme les affleurements rocheux. Dans ces endroits, vous êtes plus susceptibles d'atteindre les couches fragiles enfouies profondément et de déclencher une avalanche.

Problèmes

Problème d'avalanche 1 : Plaque à vent

Quelle altitude ?
Quelle altitude ? Limite forestière, Alpin
Quelles pentes ?
Quelles pentes ? nord, nord-est, est, sud-est, south, sud-ouest, ouest, nord-ouest
Déclenchements d'avalanche ?
Déclenchements d'avalanche ? possible
Taille prévue ?
Taille prévue ? petite - grosse

Expect to find lingering wind slabs on wind-affected slopes at higher elevations, and anywhere a slab forms over a crust or surface hoar layers. Wind slabs are more prone to be triggered on steep, convex and unsupported slopes, especially on lee features.

Problème d'avalanche 2 : Plaque persistante et profonde

Quelle altitude ?
Quelle altitude ? belowTreeline, Limite forestière, Alpin
Quelles pentes ?
Quelles pentes ? nord, nord-est, est, sud-est, south, sud-ouest, ouest, nord-ouest
Déclenchements d'avalanche ?
Déclenchements d'avalanche ? improbable - possible
Taille prévue ?
Taille prévue ? grosse - très grosse

The early December crust can be found down 100-200 cm below the surface, with weak sugary crystals (facets) on top of it. Large avalanches have been observed at all elevations including some unusual areas such as the middle of slide paths, open trees, and burns. Although the likelihood of triggering an avalanche is decreasing, there is an ongoing concern for smaller avalanches stepping down to this layer.

Détails

Sommaire des avalanches

On Monday, wind/storm slabs avalanches (up to size 1.5) were reported throughout the region; both intentionally and accidentally triggered by riders on convex features or steep slopes. Wind, warm temperatures and solar radiation have created a recent avalanche cycle (up to size 2) within the upper snowpack layers. Cornice falls were also suspected to have pulled out slabs. In the Selkirks, two very large deep persistent (size 2.5- 3) slab avalanches were also reported from various alpine aspects, which have released naturally on the December facet/crust layer.

This past week, numerous very large (size 2.5-4.5) deep persistent slab avalanches occurred in both the Selkirks and Monashees. These avalanches failed on the early December facet/crust layer, typically 100-150 cm deep. This layer is likely to plague our snowpack for the remainder of the season and will be a low probability but extremely high consequence result if triggered.

Sommaire du manteau neigeux

A variety of snow surfaces can be found: crusts at lower elevations and on solar slopes into the alpine, wind press and wind slabs in open and exposed terrain, and settling powder in sheltered areas. Surface hoar growth has also been reported at the surface and within the upper snowpack in sheltered areas

The most recent snowfall covered a layer of surface hoar now down 20-30 cm, likely responsible for the most recent natural storm slab avalanches reported Jan 20-21. The upper snowpack (top 30-100 cm) include a layer of surface hoar and crusts as well as facets formed at the start of January.

The primary weak layer that remains a widespread concern across the Columbia Mountains is a 100-200 cm deep crust/facet layer that formed in early December. There has been regular avalanche activity on this layer at all elevations for over a month.

Sommaire météo

An upper ridge over the province is giving dry conditions for the next couple of days, although some low clouds will persist in interior valleys. It will gradually start shifting east by Friday morning, opening the door for a change in the weather pattern for the weekend.

TUESDAY NIGHT: Cloudy with clear periods / Light west wind gusting 40 km/h / Low temperature -6 C / Freezing level at valley bottom.

WEDNESDAY: Cloudy with sunny periods / Moderate northwest wind / High temperature -8 C / Freezing level at valley bottom.

THURSDAY: Mix of sun and clouds / Light west wind / High temperature -4C / Freezing level at valley bottom.

FRIDAY: Mix of sun and clouds / Moderate southwest wind / High temperature -2C / Possible temperature inversion / Freezing level at 1000 m.

Confiance
Modérée

  • L’incertitude est attribuable au fait qu’il soit particulièrement difficile de prédire les plaques persistantes profondes.
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Consulter les prévisions d’avalanches du mardi 25 janvier 2022
Information sur les indices de danger

1 - Faible

Conditions avalancheuses généralement sécuritaires. Faire attention à la neige instable sur des reliefs de terrain isolés.

Avalanches naturelles improbables; déclenchements par intervention humaine improbables.

Petites avalanches dans des secteurs isolés ou en terrain extrême.

2 - Modéré

Danger accru sur des reliefs de terrain précis. Évaluer soigneusement le manteau neigeux et le terrain; repérer les reliefs de terrain préoccupants.

Avalanches naturelles improbables; déclenche- ments par intervention humaine possibles.

Petites avalanches localisées ou grosses avalanches dans des secteurs isolés.

3 - Considérable

Conditions avalancheuses dangereuses. Évaluer soigneusement le manteau neigeux. Faire preuve d'une grande prudence dans le choix d'itinéraire et la prise de décisions.

Avalanches naturelles possibles; déclenchements par intervention humaine probables.

Petites avalanches dans de nombreux secteurs, grosses avalanches localisées ou très grosses avalanches dans des secteurs isolés.

4 - Élevé

Conditions avalancheuses très dangereuses. Déplacements en terrain avalancheux non recommandés.

Avalanches naturelles probables; déclenchements par intervention humaine; très probables.

Grosses avalanches dans de nombreux secteurs ou très grosses avalanches localisées.

5 - Extrême

Évitez tous les terrains avalancheux

Avalanches naturelles certaines; déclenchements par intervention humaine certains.

Avalanches variant de grosses à très grosses dans de nombreux secteurs.

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List of avalanche forecast RSS feeds

  • Cariboos — https://avalanche.ca/api/forecasts/cariboos.rss
  • Kananaskis Country, Alberta Parks — https://avalanche.ca/api/forecasts/kananaskis.rss
  • Kootenay Boundary — https://avalanche.ca/api/forecasts/kootenay-boundary.rss
  • Lizard Range and Flathead — https://avalanche.ca/api/forecasts/lizard-range.rss
  • North Columbia — https://avalanche.ca/api/forecasts/north-columbia.rss
  • North Rockies — https://avalanche.ca/api/forecasts/north-rockies.rss
  • Northwest Coastal — https://avalanche.ca/api/forecasts/northwest-coastal.rss
  • Northwest Inland — https://avalanche.ca/api/forecasts/northwest-inland.rss
  • Purcells — https://avalanche.ca/api/forecasts/purcells.rss
  • Sea To Sky — https://avalanche.ca/api/forecasts/sea-to-sky.rss
  • South Coast — https://avalanche.ca/api/forecasts/south-coast.rss
  • South Coast Inland — https://avalanche.ca/api/forecasts/south-coast-inland.rss
  • South Columbia — https://avalanche.ca/api/forecasts/south-columbia.rss
  • South Rockies — https://avalanche.ca/api/forecasts/south-rockies.rss
  • Yukon — https://avalanche.ca/api/forecasts/yukon.rss
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