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Archived

Avalanche Forecast

Mar 18th, 2025–Mar 19th, 2025
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
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: Little Yoho.

Mt. Field, Mt Dennis and Mt. Stephen avalanche closure zones are CLOSED on Wednesday, March 19th.

The sun is forecast to come out on Wednesday and this might increase the danger on solar aspects. Don't expose yourself to avalanche terrain, especially if the sun is out and warming the slopes!

Confidence

Moderate

Avalanche Summary

No new avalanches observed in Little Yoho, however in neighboring BYK:

A group digging a snowpit in low angle terrain with no overhead exposure on Observation Peak today felt a whumph that remote triggered 5-6 avalanches up to size 2.5 in the cirque around them. This remote trigger with large propagation highlights the dangerous snowpack conditions we are currently in.

Snowpack Summary

At treeline, ~70-100cm of snow overlies the Jan. 30th / Feb. 22nd drought layers. This layer is ~ 20-30 cm of facetted crystals that are weaker than the snowpack above and have been reactive in snowpack tests and with avalanches in the last 10 days. Average snowpack depths at treeline are ~ 200cm

Weather Summary

A ridge of high pressure is over us and will bring sun on Wednesday. Temperatures will remain seasonal, between (-1 and -10) except in the direct sun where it will warm up fast. Alpine winds will be moderate from the SW.

On Thursday, a series of systems start to move in bringing light snow. Friday we should see a bigger system with 5-10 cm forecast by Saturday AM.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.

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 starting zones and be very wary of overhead hazard.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3.5

Loose Wet

If the sun is out, the snow will warm quickly and loose wet avalanches will start to run. These could be a trigger for the deeper layers resulting in larger avalanches.

Aspects: South, South West, West.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2