Avalog
Register
Get forecast notifications
Create an account to receive email notifications when forecasts are published.
Register
Login
Archived

Avalanche Forecast

Mar 28th, 2017–Mar 29th, 2017
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.

Watch for wind slabs in alpine lee areas due to new snow and strong West wind.

Weather Forecast

Snowfall expected over the next few days with 10 cm on Wednesday and 3 cm on Thursday. Freezing levels should reach 1800m each day, with alpine temperatures ranging from -1 to -12. Winds are generally moderate but will pick up to strong tonight and into tomorrow.

Snowpack Summary

10-15cm of soft snow sits on 100cm of dense, rounded snow comprising the upper half of the snowpack. This sits on a variety of foundations depending on location. In shallow areas (eg: Field ice climbs) the base is weak depth hoar. In deeper areas (eg: Little Yoho Valley), the base is stronger. Shears persist in the deep facets in shallow areas.

Avalanche Summary

No reports were received of any new avalanche activity in the Field, Emerald Lake or Little Yoho areas.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Avalanche Problems

Persistent Slabs

The snowpack is stabilizing after last week's cycle, and now we are left with a classic low probability, high consequence problem. Natural avalanches have mostly ceased, but triggering is still possible - especially from large loads like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 4

Cornices

There has been an increasing frequency of cornice failures this past week. Be wary of this as we transition into spring (cornice season). They are a hazard underfoot on ridge crests, and from overhead if you travel below one. GIve them a wide berth.

  • Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

New snow and strong West wind will create windslabs at high elevations. The touchiness of the wind slabs is uncertain as of Tuesday afternoon.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2