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Archived

Avalanche Forecast

Jan 3rd, 2019–Jan 6th, 2019
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Waterton Lakes.

There has been significant Wind Slab development with the recent extreme wind event. Expect these new Wind Slabs to become more reactive with the rising freezing level on Saturday.

Weather Forecast

FRIDAY 10-15 cm of precipitation with strong SW winds and gusts up to 90km/h SATURDAY Freezing Levels rising to 1900m with winds easing to 40 km/h. Sunny.SUNDAY 5-10 cm precipitation with a 1200m freezing Level and Moderate SW winds.

Snowpack Summary

10-15 cm of recent Storm snow with Extreme SW winds has led to significant Wind Slab development in lee terrain. Expect these wind Slabs to become more reactive as the freezing level rises to 1900m on the weekend. The Surface Snow is moist to 1550m.

Avalanche Summary

Lim observations today due to Extreme Wind event.

Confidence

Due to the number of field observations on Thursday

Avalanche Problems

Wind Slabs

Use caution in lee areas. Wind loading could create slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3