Banff Yoho & Kootenay National Park Avalanche Forecast

Issued: Nov 17th, 2021 5:12PM

Wed Nov 17th Current Conditions
Alpine Considerable Treeline Moderate Below Treeline Low
Thu Nov 18th 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Fri Nov 19th 3 Day Outlook
Alpine Considerable Treeline Moderate Below Treeline Low

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs and Storm Slabs.

Natural avalanches were still observed in past 36 hours. Conservative decision making is still required.

Summary

Weather Forecast

Mixed sun and cloud for Thursday with light snow beginning on Thursday night. Valley bottom highs of around -4 and ridge-top highs of -12 forecast for Thursday.

Snowpack Summary

Several cm of fresh snow exist over a surface crust (below 2100m). Recent storm snow (5 day total of 65-90 cm) is starting to settle. A melt/freeze crust exists near the ground (in some locations). Wind slabs and residual storm slabs exist in alpine and down into tree-line elevations. Snowpack depths at tree-line average 60-110 cm.a

Avalanche Summary

The natural avalanche from the recent storm has tapered however Lake Louise Ski Resort is still reporting explosive triggered and natural avalanches on Wednesday. These are primarily windslabs up to size 2 in the alpine, however one natural size 3 was also observed.

Confidence

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Likely - Possible

Expected Size

1 - 2.5

Windslabs exist in the alpine and down into some tree-line locations. There is lots of snow available for transport so watch local conditions.

  • Use caution in lee areas. Recent wind loading have created wind slabs.
  • Watch for surface cracking and stiffer surface layers of snow. Avoid wind loaded terrain.

Aspects:

North, North East, East, South East.

Elevations:

Alpine, Treeline.

Storm Slabs

An icon showing Storm Slabs

Likelihood

Possible

Expected Size

1 - 2

Storm snow is beginning to settle and bond but residual storm slabs still exist in alpine and tree-line locations.

  • Make observations and assess conditions continually as you travel.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Valid until: Nov 18th, 2021 4:00PM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.