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Archived

Avalanche Forecast

Mar 24th, 2021–Mar 25th, 2021
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
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: Banff Yoho Kootenay.

Some variability in the forecast region - pay attention to local wind effect and recent storm snow amounts to gauge the hazard.

Weather Forecast

Trace amounts of snow expected for Thursday as a weak system crosses the rockies. Ridge winds are expected to be light  Freezing levels will rise to 2000 m in afternoon.  See https://avalanche.ca/weather/forecast for more details.

Snowpack Summary

15-40 cm of snow has fallen at treeline since March 19th with variable SW-NW winds. This storm snow sits over a sun crust (up to ridge tops) on solar aspects, and over a mix of surfaces on North aspects including facets and spotty surface hoar, and over a temperature crust at lower elevations. Thin areas becoming isothermal below treeline.

Avalanche Summary

Few small wind slabs in the high alpine were ski cut in the Sunshine area today and some loose dry to size 1.5 in steep NW alpine features in Little Yoho during a snow squall event.

Confidence

Due to the number and quality of field observations

Avalanche Problems

Wind Slabs

Small wind slabs can be found in lee areas of the high alpine that could be triggered by skiers in steep terrain. On solar aspects these wind slabs may sit over a buried sun crust that can act as a sliding layer.

  • Be careful with wind loaded pockets, especially in steep confined alpine terrain.

Aspects: North, North East, East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2

Storm Slabs

Gathering information on this interface - still could be reactive to skiers where there is 25-35+ cm of storm snow over the March 19 interface of facets, spotty surface hoar or sun crust, . It's not a problem in areas with less storm snow.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5