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Archived

Avalanche Forecast

Feb 26th, 2024–Feb 27th, 2024
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Updated 7:24

Weak layers in the top meter of the snowpack remain rider and remotely triggerable.

Confidence

Moderate

Avalanche Summary

Natural, rider, and remotely triggered storm and wind slab avalanches size 1-2 were reported throughout the region over the past 3 days. On Sunday, explosive work produced wind slabs up to size 2.5.

Most of the recent avalanches were on north aspects at treeline and above. The failure plane has been predominantly facets under the recent storm snow, but in some cases slabs ran on a buried crust with crowns 50 to 100 cm deep.

Snowpack Summary

30 to 60 cm of recent snow has been redistributed by wind at upper elevations. It may take some time to bond to underlying snow, including facets and crusts as well as surface hoar in wind-sheltered terrain.

A thick crust with weak facets overtop was buried in early February and is now 50 to 100 cm deep. It has been a problematic layer for step-down avalanches.

Below, the mid and lower snowpack is generally well-bonded and strong.

Weather Summary

Colder end of forecast temperature ranges are for areas north of Stewart.

Monday night

Partly cloudy. 10 to 20 km/h northeast ridgetop wind. Treeline temperature -16 to -24 °C.

Tuesday

Mostly cloudy with 5-10 cm of snow. 30 to 50 km/h south ridgetop wind. Treeline temperature -12 to -16 °C.

Wednesday

Overnight flurries bringing 5-10 cm then a mix of sun and cloud. 20 to 40 km/h southeast ridgetop wind. Treeline temperature -5 to -12 °C.

Thursday

A mix of sun and cloud. 30 to 50 km/h southeast ridgetop wind. Treeline temperature -6 to -10 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.

Avalanche Problems

Wind Slabs

Recently formed slabs may be slow to bond to underlying surfaces.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Persistent Slabs

A weak layer of facets over a crust buried in early February is now 50 to 80 cm deep. It has been a problematic sliding surface for step-down avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5