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Avalanche Forecast

Archived

Mar 28th, 2018–Mar 29th, 2018

Alpine
Natural avalanches possible, human triggered probable.
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

Kootenay Boundary.

Check for how the new snow is bonding to previous surfaces especially on shady aspects where it may be sitting on a weak layer of surface hoar. Reduce your exposure to sunny slopes if the sun makes an appearance.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

THURSDAY: Mostly cloudy with isolated flurries / Light to moderate southwest wind / Alpine temperature -3 / Freezing level 1500 m. FRIDAY: Mix of sun, cloud and isolated flurries / Light west wind / Alpine temperature -2 / Freezing level 1600m SATURDAY: Mix of sun and cloud / Light to moderate east wind / Alpine temperature -2 / Freezing level 1600m

Avalanche Summary

On Monday there were reports of numerous explosives and naturally triggered storm slab avalanches size 1.5-2 on all aspects in the alpine and tree line. Sunday there was a report of a natural size 2 wind slab and a skier triggered size 1 wind slab release. Both of these were on northeasterly aspects above 2000 m. Also on Sunday explosive control work produced numerous size 1.5-2 storm slab results all failing in the recent storm snow (25-40 cm deep) on north and northwest aspects above 2000 m.Saturday we received reports of several remotely (from a distance) triggered and skier-triggered size 2 storm slab release that failed 40-50 cm deep on a mix of buried crusts, surface hoar and facets. Explosive control work also produced size 1.5-2 storm slab results running on a crust on southeast aspects from 1900 -2000 m. Read more here. And here.

Snowpack Summary

30-50 cm of recent snow sits on a crust at all elevations on solar aspects and all aspects below 1900 m elevation. On northerly aspects at and above treeline the storm snow is burying a mix of large surface hoar and surface facets. Two other weak layers are present in the upper snowpack. A layer buried mid March is down 30 to 60cm is crust on solar aspects and surface hoar on high elevation north. A layer buried early March is 50 to 80cm below the surface and is similar in composition to those just described.A few other persistent weak layers are buried in the mid and lower snowpack, but they have gone dormant and are unlikely to resurface until we move into a period with consecutive above-freezing nights later in the spring.

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.