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Avalanche Forecast

Archived

Jan 8th, 2019–Jan 9th, 2019

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

Kootenay Boundary.

Snowfall amounts and freezing levels are uncertain on Wednesday. Be ready to adjust your plans according to conditions as you find them.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

TUESDAY NIGHT: 5-10 cm snow. Freezing level at valley bottom. Moderate to strong south-westerly winds. Alpine high near -6. WEDNESDAY: 5-10 cm snow. Freezing level near 1000 m. Moderate to strong south-westerly winds. Alpine high near -3. Expect a further 5-10 cm snow overnight. THURSDAY: 2-5 cm snow. Freezing level rising to near 1500 m. Moderate south-westerly winds. Alpine high near -1. FRIDAY: Cloudy with flurries. Freezing level near 1400 m. Light south-westerly winds. Alpine high near -1. More details can be found in the Mountain Weather Forecast.

Avalanche Summary

Several small wind slabs were triggered by people on Monday on north to north-east aspects near treeline. On Sunday, several explosives-triggered avalanches to size 2 were reported in the region at or near treeline on all aspects.

Snowpack Summary

Recent snow and winds have created variable storm slabs and wind slabs. Wind slabs were observed at all elevations on Monday. Isolated layers of surface hoar and or crusts may be found in the upper snowpack. Around 1 m down in the snowpack is a buried weak layer that formed in early December. It consists of a rain crust, surface hoar, and facets (sugary snow). Professionals continue to monitor this interface as it has potential to produce large avalanches, although the likelihood of triggering has gone down. It is most likely to be triggered from a thin-spot trigger point or with a large load, like cornice fall.

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.