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Avalanche Forecast

Apr 5th, 2023–Apr 6th, 2023
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Wind slabs remain the primary concern as light snowfall and strong wind continues. Watch for wind slabs around ridgelines and in mid slope terrain features in areas that see stronger winds.

Confidence

Moderate

Avalanche Summary

Reactive wind slabs were reported on Sunday at alpine elevations in north facing terrain.

On Saturday a rider triggered a cornice fall from a distance, which produced a size 3 persistent slab avalanche on a northeast aspect at 1750 m. The avalanche was 200 cm deep and was suspected to have failed on a layer of facets above a crust buried in January.

Let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

Gradual accumulations of fresh snowfall will be redistributed by southerly winds into wind slabs over previously wind affected snow on north and east facing slopes. South facing terrain will likely be stripped back to a crust by these winds.

A weak layer of surface hoar/crust/facets buried in early January is now over 1 m deep in most areas. This layer has produced recent avalanche activity and remains a concern in terrain where the snowpack is thin.

The lower snowpack consists of basal facets, particularly in shallow areas.

Weather Summary

Wednesday Night

Cloudy with up to 5 cm. Moderate to strong southerly winds. Freezing levels drop to 500 m.

Thursday

Cloudy with up to 5 cm. Moderate to strong southerly winds. Freezing levels around 1200 m.

Friday

Mostly cloudy with trace amounts of snowfall. Moderate southerly winds. Freezing levels remain below 1000 m.

Saturday

Light snowfall returns with strong to extreme southerly winds. Freezing levels around 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Carefully evaluate steep lines for wind slabs.
  • Use caution on large alpine slopes, especially around thin areas that may propagate to deeper instabilities.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Avalanche Problems

Wind Slabs

Wind slabs are present at higher elevations, in north and east facing terrain features. Small accumulations of fresh snow and continued winds may continue to build these slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

A layer of facets sitting on a crust buried in January has recently been reactive. Triggering is most likely in areas where the snowpack is thin and weak, or with a heavy load like a cornice fall or the weight of a smaller avalanche in motion triggering this deeper layer.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely

Expected Size: 2 - 3