Banff Yoho & Kootenay National Park Avalanche Forecast

Issued: Feb 3rd, 2021 4:00PM

Wed Feb 3rd Current Conditions
Alpine Considerable Treeline Considerable Below Treeline Moderate
Thu Feb 4th 2 Day Outlook
Alpine Considerable Treeline Moderate Below Treeline Moderate
Fri Feb 5th 3 Day Outlook
Alpine Considerable Treeline Moderate Below Treeline Low

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

Avalanche Control is taking place on Mt. Whymper (93 South) and Mt. Bourgeau (Sunshine Village Road) on Thursday Feb 4th. No climbing or skiing in these areas!

Increasing winds will keep the avalanche hazard elevated on Thursday.

Summary

Weather Forecast

Thursday will be mainly cloudy with isolated flurries with snow accumulations up to 2cm. Winds will increase during the early morning up into the strong range (40-60km/hr) from the West to North West, tapering off by the late evening. Alpine temps ranging from -8 to -15.

Snowpack Summary

30-60 cm of snow over the last week. This snow is low density below tree line, but is forming slabs up to 100 cm deep above tree line where the wind has redistributed it in lee features. The mid snowpack has a series of persistent weak layers that remain dormant. Height of snow at tree line is 150-220 cm.

Avalanche Summary

Explosive avalanche control on Mt. Field, Mt. Stephen and Mt. Dennis on Wednesday produced numerous size 2.0 avalanches and several up to size 2.5.

A natural avalanche cycle occurred on Tuesday up to size 2.5, which had periods of intense loading, snowing up to 5cm an hour for a few hours. Natural avalanche activity has since tapered off.

Confidence

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Likely

Expected Size

1 - 2.5

Increasing winds, up into the strong range (40-60km/hr) from the West to North West will redistribute the recent storm snow into wind slabs in the alpine and open areas at tree line.

  • Use caution in lee areas. Recent wind loading has created wind slabs.
  • Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Loose Dry

An icon showing Loose Dry

Likelihood

Likely - Possible

Expected Size

1 - 1.5

Up to 60 cm of storm snow has been sluffing easily in steep terrain. Avoid committing yourself to steep, confined terrain if it has not already sluffed out.

  • Be aware of party members below you that may be exposed to your sluffs.
  • Be careful of loose dry power sluffing in steep terrain.

Aspects:

All aspects.

Elevations:

All elevations.

Valid until: Feb 4th, 2021 4:00PM

Forecast Trend

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