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Archived

Avalanche Forecast

Feb 19th, 2019–Feb 20th, 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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Kootenay Boundary.

Human triggered avalanches remain possible at all elevations. A cautious approach to backcountry travel is recommended.

Confidence

High -

Weather Forecast

TUESDAY NIGHT -Mainly cloudy with scattered flurries / northwest winds 10-20 km/h / alpine low temperature near -11WEDNESDAY - A mix of sun and cloud / northeast winds 10-20 km/h / alpine high temperature near -9THURSDAY - A mix of sun and cloud / northwest winds 10-20 km/h / alpine high temperature near -9FRIDAY - Mainly cloudy with flurries, 2-4 cm / southwest winds, 15-35 km/h / alpine high temperature near -10

Avalanche Summary

Numerous skier triggered avalanches have been reported everyday for the past week. Although most avalanches have been small (size 1-1.5), some have shown impressive propagation. Check some of the recent MIN reports for examples (here and here).

Snowpack Summary

Surface snow consists of a mix of low density snow and wind affected surfaces. 20 to 40 cm of snow from the past week is gradually settling, and in some areas has shown signs of becoming reactive above above a surface hoar and crust layer that was buried on February 7th. This layer is suspect at all elevations, particularly on wind loaded slopes and on steep south-facing terrain.Two other surface hoar layers are buried 50 to 80 cm deep the snowpack (referred to as the February 1st and mid-January layers). Although they have not been reactive recently, they are still being monitored by professionals. These layers are most prevalent below treeline on shady aspects. The lower snowpack is well settled.

Avalanche Problems

Persistent Slabs

It remains possible to trigger an avalanche on one of the surface hoar or crust layers buried 30 to 80 cm deep. These layers are most prominent at treeline and below.
Caution around sheltered open areas at treeline and below including cutblocks, gulleys, and glades.Surface hoar distribution is highly variable. Avoid generalizing your observations.Use caution on open slopes and convex rolls

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Wind Slabs

Wind slabs can be found on a variety of aspects due to variable wind directions.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Use caution in freshly wind-loaded features, especially near ridge crests.Wind from a variety of directions has formed wind slabs in unusual locations.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2