Banff Yoho & Kootenay National Park Avalanche Forecast

Issued: Mar 23rd, 2021 4:50PM

Tue Mar 23rd Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Wed Mar 24th 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Low
Thu Mar 25th 3 Day Outlook
Alpine Moderate Treeline Low Below Treeline Low

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

Pay attention to local wind effect. There is lots of snow available for transport and there have been reports of increased wind slap development in the alpine.

Summary

Weather Forecast

Wednesday will be overcast with light flurries throughout day (total accumulation at treeline ~5-10 cm). Winds will be westerly 40-60 km/h in morning and diminish throughout day. Freezing levels will rise to 16-1700m in afternoon.

Snowpack Summary

15-40 cm of snow has fallen at treeline since March 19th with variable SW-NW winds. This storm snow sits over a sun crust (up to ridge tops) on solar aspects, and over a mix of surfaces on North aspects including facets and spotty surface hoar, and over a temperature crust at lower elevations. Thin areas becoming isothermal below treeline.

Avalanche Summary

Several small natural wind slab were observed out of steep alpine terrain throughout region today. Sunshine reported skier triggered wind slabs and loose dry up to size one. One wet loose avalanche reported from Haffner Creek out of steep rocky terrain at 1800 m.

Confidence

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Possible

Expected Size

1 - 2

Small isolated wind slabs can be found in lee areas of the alpine that could be triggered by skiers in steep terrain. On solar aspects these wind slabs may sit over a buried sun crust that can act as a sliding layer.

  • Be careful with wind loaded pockets, especially in steep confined alpine terrain.

Aspects:

North, North East, East.

Elevations:

Alpine.

Loose Dry

An icon showing Loose Dry

Likelihood

Possible

Expected Size

1 - 1.5

There has been enough recent snow to produce dry loose avalanches in steep gullies and couloirs over the past couple days. These could occur naturally with additional wind, or be triggered by skiers in steep terrain.

  • Be careful of loose dry sluffing in steep, confined or exposed terrain.

Aspects:

North, North East, East, South East, North West.

Elevations:

Alpine.

Storm Slabs

An icon showing Storm Slabs

Likelihood

Possible

Expected Size

1 - 1.5

In places with 25-35+ cm of storm snow over the March 19 interface of facets, spotty surface hoar or sun crust, some small soft slabs are failing with skier traffic in steep terrain. This is not as much of a problem in areas with less storm snow.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Valid until: Mar 24th, 2021 4:00PM

Forecast Trend

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