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Archived

Avalanche Forecast

Mar 9th, 2020–Mar 10th, 2020
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
1: Low
The avalanche danger rating below treeline will be low
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
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.

A forecasted wind event is expected on Tuesday creating fresh wind slabs. Additionally, up to 20cm is expected in Little Yoho by Wednesday morning.

Weather Forecast

The high pressure system will start to close out on Tuesday. As this happens wind will increase significantly from the SW in to the strong to extreme range. Snow will start Tuesday afternoon and by Wednesday morning expect up to 20cm. Temperatures will stay in the range of -5 in the valley and -15 at the ridge.

Snowpack Summary

In the alpine the wind is starting to produce soft slabs in lee areas. New sun crusts exist on steep solar aspects. 40-50 cm of recent snow sits over the Feb 29 crust interface on steep solar aspects. In thin snow pack areas a dense mid-pack sits over a weak, faceted base, while thick areas have a stronger base.

Avalanche Summary

Avalanche control on Mt Dennis produced results to size 3 (large cornices that entrain facets and new snow). Evidence of avalanches up to size 3 from the cycle from the past few days in the Little Yoho region.

Confidence

Wind speed and direction is uncertain on Tuesday

Avalanche Problems

Wind Slabs

This problem has transitioned from a storm slab. The wind is expected to pick up significantly on Tuesday, creating new wind slabs. Storm slabs may slabs may linger in locations that dont see the wind.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2