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Archived

Avalanche Forecast

Apr 24th, 2021–Apr 27th, 2021
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
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

Regions: Waterton Lakes.

20-30cm of new snow sits over a firm crust potentially making storm slabs reactive to human triggers.

Give the new snow time to settle as we transition back to spring conditions early next week.

Weather Forecast

10mm of precipitation is expected Saturday - Sunday evening with freezing levels at approx 2000m. Clearing trend begins Monday.

Avalanche Canada's Mountain Weather Forecast is a great regional-scale resource for up-to-date weather information. SPOTWX is a good resource for local scale weather forecasts.

Snowpack Summary

20-30cm of recent snowfall has formed a storm slab which sits over a supportive crust. This crust exists at all elevations except on above 2100m north faces. The snowpack below the storm slab is well consolidated with large cornices lingering in the alpine.

Avalanche Summary

Multiple loose dry avalanches up to Size 1.5 observed on solar aspects on Friday.

Please consider submitting a MIN report if you see avalanche activity.

Confidence

Avalanche Problems

Storm Slabs

Convective storm activity has led to variable amounts of snowfall throughout the park. Pay attention to changing conditions and avoid areas of heavy loading. The new snow will need time to settle before venturing out in to more exposed terrain. 

  • Use caution in alpine and open treeline lees. Recent snowfall has created storm slabs.
  • The storm slab may be more sensitive to human triggering on solar aspects where it sits on a crust

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Loose Wet

Recent snowfall will become saturated with moisture as snow turns to rain at lower elevations on Sunday.

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

Elevations: Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5