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Archived

Avalanche Forecast

Apr 8th, 2019–Apr 9th, 2019
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Kootenay Boundary.

The recent storm snow is bonding well with the underlying layer. The amount of new snow overnight is uncertain.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

MONDAY NIGHT: Cloudy / up to 10 cm of accumulation in the south of the region / light southeast wind / freezing level 1500 mTUESDAY: Mainly cloudy with flurries / light to moderate northerly wind / alpine temperature -2 C / freezing level 1900 mWEDNESDAY: Mainly cloudy with sun and scattered flurries / light to moderate northwest wind / alpine temperature -2 C / freezing level 1800 mTHURSDAY: Mainly cloudy / up to 10 cm accumulation overnight / light southwest wind / alpine temperature -5 C / freezing level 1700 m

Avalanche Summary

On Sunday, there were reports of numerous natural, human and explosive triggered storm slab avalanches up to size 2.5 at treeline and in the alpine on all aspects (see this MIN report).On Saturday, explosives triggered small (size 1-1.5) storm slab avalanches up to 30 cm deep. Skier traffic triggered small pockets of storm snow with the deepest (up to 40 cm) and most reactive deposits in specific lee terrain.Numerous small loose wet avalanches were observed on Friday during daytime warming.

Snowpack Summary

10-35 cm of recent storm snow that fell over the weekend sits on a melt-freeze crust on all aspects except for north facing slopes above 2000 m, where it sits on dry snow and surface hoar (feathery crystals). Recent snowfall amounts taper quickly below treeline.

Avalanche Problems

Storm Slabs

10-35 cm of recent storm snow is bonding well with the underlying layer which consists of a melt-freeze crust in most locations and dry snow on north facing slopes above 2000 m. New snow overnight might increase the potential for slab avalanches.
New snow will require a few days to settle and stabilize.Use caution on open slopes and convex rolls

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2