Avalanche Forecast

Issued: Mar 1st, 2024 12:45PM

The alpine rating is high, the treeline rating is high, and the below treeline rating is high. Known problems include Persistent Slabs, Wind Slabs and Deep Persistent Slabs.

Avalanche Canada mkoppang, Avalanche Canada

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Good time to avoid all avalanche terrain and head to a local resort.

Give the new snow time to settle and bond.

A Special Public Avalanche Warning is in effect. Click the red SPAW link for details.

Summary

Confidence

High

Avalanche Summary

Observations were limited due to the weather but we were able to see one size 2.5 avalanche on a NE aspects on Little Tent Ridge that had a 200m wide propagation. The suspected failure plane is the Feb 3rd Crust. We suspect that a natural cycle is still ongoing.

A late day report also came in of a sz 3.5 skier remote from 75m away near Purple knob that ran full path taking out mature timber.

Snowpack Summary

55-85cm of recent snow is now overlying the Feb 3rd crust complex. Storm slabs and wind slabs can be expected in this new snow which will be easy to trigger with a skiers weight. A weak layer of facetted crystals also exists above and below this crust that has been producing moderate sheers. This new snow is beginning to overload this layer and cause a natural avalanche cycle. The November basal facets are alive and well and back on our radar as the February 2 rain crust is deteriorating and not locking in the weaknesses below as it once did. Skier weight has now been able to break through the Feb 2 rain crust in some places, which means that the basal facets can now be more easily affected.

This is a good time to avoid all avalanche terrain

Weather Summary

Light snow will continue overnight with accumulations of around 5cm snow. Winds are forecast to become more easterly overnight with peak speeds around 40km/hr. A grey-bird day is in store again with not much in the way of sun and temperatures around -15C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid exposure to overhead avalanche terrain, avalanches may run surprisingly far.
  • Avoid all avalanche terrain during periods of heavy loading from new snow, wind, or rain.

Problems

Persistent Slabs

An icon showing Persistent Slabs

New snow is overloading the Feb 3rd persistent layer interface that developed in the warm spell in early February.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely - Certain

Expected Size

1 - 3

Wind Slabs

An icon showing Wind Slabs

Failures within the recent snow including windslabs, and storm slabs from rapid settlement have been observed in all elevations. Open areas below treeline where the new now is settling should be carefully evaluated.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely - Certain

Expected Size

1 - 2.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Avalanche may step down to the weeker deep basal layers.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Very Likely

Expected Size

2 - 3.5

Valid until: Mar 2nd, 2024 3:00PM