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Archived

Avalanche Forecast

Mar 13th, 2019–Mar 14th, 2019
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
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: Banff Yoho Kootenay.

The danger is Moderate, but will change fast with inputs like sun, wind, etc. This is due to the fact that we have prominent facets that are fickle to these inputs, and haven't had warmer spring temperatures yet. Watch for these changes locally. 

Weather Forecast

Thursday will see temperatures near 0C at valley bottom and around -10C at 3000m.  W winds will increase in the afternoon into the moderate range at 3000m with no new snow expected.  There could be increased solar input especially in the E with less cloud cover.  A big warmup is predicted next week which will be something to watch out for. 

Snowpack Summary

15-30cm recent low density snow (higher amounts in western regions) over previously wind blown surfaces in the alpine, and 30-50cm of facets below. Lower elevations are completely faceted to ground. Steep areas continue to produce sluffing in many areas with buried suncrust on steep S aspects.

Avalanche Summary

Avalanche control today in Yoho confirms the combination of smaller (size 2) wind slabs entraining facets producing avalanches that run far for their mass.  Slides to size 3 were produced on Mount Field and Bosworth where they entrained facets, and only produced smaller slides where they did not.  Other areas out E have far less activity.

Confidence

Avalanche Problems

Wind Slabs

New snow and strong SW winds have built variable wind slabs in open areas above treeline. These slabs are sitting on the weak, faceted snow that was previously on the surface and as a result can run further than expected when triggered.
Watch for surface cracking and stiffer surface layers of snow.Use caution in lee areas. Recent wind loading has created wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Loose Dry

If triggered on their own, loose dry avalanches that are smaller in size can be initiated in steep terrain.  If triggered by a wind slab, much larger avalanches that can run far are possible as they entrains facets on the way down.
Good group management is essential to manage current conditions safely.Use caution above cliffs and terrain traps where small avalanches may have severe consequences.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3