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Archived

Avalanche Forecast

Apr 20th, 2018–Apr 21st, 2018
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
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
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: Kananaskis.

We are expecting some snow tomorrow. How much remains to be seen, as forecasts vary. On a different note, cornices are proving to be an issue with triggering the deep basal layers. Limit exposure to cornice threatened slopes.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

Alpine lows will only be -3C tonight. If the forecasted flurries arrive overnight, the surface re-freeze may be minimal. Tomorrow will see more flurries, giving 6cm. The freezing level will rise to 2000m as the front plays through. We may see wet flurries, or even rain/drizzle at lower elevations. Winds will also increase to 65km/hr tomorrow. A daytime high of -3C.

Avalanche Summary

A few loose wet avalanches were witnessed during the hottest part of the day (2pm).

Snowpack Summary

Most areas have a thin surface crust from yesterday's sun. The high alpine and steep north aspects are the only areas that don't have some sort of crust issue. By midday, these crusts were breaking down as soon as they saw a few minutes of sun. Expect these crusts to refreeze tonight. Cornices remain a worry as they are widespread, and large!

Avalanche Problems

Wind Slabs

Depending on which forecast you use, we may see fresh windslabs build on top of today's crusts. Expect a poor bond with the crust.
Avoid freshly wind loaded features.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Cornices

This year's crop is the biggest in recent memory. Give them lots of respect, regardless if it sunny or not.
Pay attention to overhead hazards like cornices which could easily trigger persistent slabs.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1.5 - 3