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Archived

Avalanche Forecast

Mar 21st, 2025–Mar 22nd, 2025
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
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
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: Little Yoho.

Due to limited field observations, the likelihood of triggering large avalanches on persistent weak layers in this region is uncertain.

Conservative decision-making is recommended.

Confidence

Moderate

Avalanche Summary

No new avalanches were observed in Little Yoho. On Wednesday, avalanche control on Mont Field and Dennis produced avalanches to size 2.5 on the persistent layer.

Over the past two weeks, many large avalanches have been seen in adjacent areas to the East of the divide. See Banff bulletin for details.

Snowpack Summary

At treeline, 70-100 cm of snow overlies the Jan. 30 / Feb. 22 drought layers, which consist of 20-30 cm of weak faceted crystals. These layers have been reactive in tests and recent avalanches. Average snowpack depth at treeline is ~200 cm.

In this thicker snowpack region, the facet/depth hoar basal layer is less prominent than it is East of the divide but likely exists in thin areas. Expect a surface crust on solar aspects at treeline and below.

Weather Summary

Saturday - Trace amounts of snow, light to moderate winds.

Sunday - mainly cloudy, moderate West wind

see the table below

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Remote triggering is a big concern, be aware of the potential for wide propagations and large, destructive avalanches at all elevations.
  • Wind slabs are isolated, but may remain reactive.

Avalanche Problems

Persistent Slabs

A 60-100 cm slab overlies mid-pack facets. We have limited observations from this zone since the storm, but this layer seems less reactive in Little Yoho than in areas further east. Caution is advised as this layer needs time to stabilize: avoid start zones and be very wary of overhead hazard.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2 - 3.5

Wind Slabs

Smaller wind slabs have likely formed from recent winds. Some light snow Friday with wind will add to this problem. We are uncertain about how prevalent these are in Little Yoho due to limited field observations.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 1.5