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Archived

Avalanche Forecast

Jan 4th, 2019–Jan 7th, 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
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
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
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

15-20cm of 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 Saturday. The mid snowpack is generally well settled but there is potential for avalanches to step down to deeper weak layers.Surface Snow is moist to 1550m.

Avalanche Summary

Limited visibility during this storm cycle.

Confidence

Freezing levels are uncertain on Saturday

Avalanche Problems

Storm Slabs

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

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

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

Avoid convexities and thin snowpack locations.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3