Archived

Avalanche Forecast

Apr 12th, 2019–Apr 13th, 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

3: Considerable

The avalanche danger rating in the alpine will be considerable

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

3: Considerable

The avalanche danger rating in the alpine will be considerable

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.

Snowfall amounts and timing of the approaching snowstorm are uncertain. As storm totals approach 10 cm moderate to strong southwest winds will likely create shallow wind slabs.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

FRIDAY NIGHT: Clear with cloudy periods and flurries / moderate southwest wind / alpine low -4 C / freezing level 1400 mSATURDAY: Cloudy / up to 10 cm snow accumulation / moderate to strong southwest wind / alpine high -4 C / freezing level 1700 mSUNDAY: Mix of sun and cloud with flurries / up to 10 cm snow accumulation Sunday night / moderate southwest wind / alpine high -6 C / freezing level 1500 mMONDAY: Mix of sun and cloud / light southwest wind / alpine high -5 C / freezing level 1700 m

Avalanche Summary

On Thursday, no new avalanche activity was observed. On Wednesday, only a few explosive triggered wind slab avalanches were reported.On Tuesday, a few human triggered wind/storm slabs up to size 1 were observed on sun affected slopes in the alpine.

Snowpack Summary

The new snow likely falls on a melt-freeze crust on all aspects except for north facing slopes above 2000 m, where the snow surface consists of dry snow. Last week's unsettled weather produced 10-35 cm of snow and is bonding well with the underlying layers.Snowfall amounts taper quickly below treeline.

Avalanche Problems

Wind Slabs

Moderate to strong southwest winds might transport the new snow and create shallow wind slabs during the day. Older wind slabs can be found in alpine lee features and might still be sensitive to human triggers.

Use caution in lee areas and cross-loaded terrain near ridge crests.Watch for signs of instability such as whumpfing, or cracking.

Aspects: North, North East, East, North West.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5