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Avalanche Forecast

Archived

Feb 21st, 2024–Feb 22nd, 2024

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Normal cautions should be sufficient to manage lingering wind slabs in steep terrain near ridgetops.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported in the past few days. Operators in the Hope area noted small sluffing of new snow from steep terrain on Wednesday, confined to areas where smooth snow coverage exists.

Snowpack Summary

Light new snow amounts have begun to accumulate over a variety of surfaces including; surface hoar in sheltered terrain, A crust on south aspects and all aspects below treeline and old wind effected surfaces in exposed terrain.

A widespread crust exists 25-40 cm below the surface, and surface hoar has been found above the crust in some parts of the region. Old, likely stubborn wind slabs formed over this layer are a lingering concern.

The remainder of the snowpack is well settled. Conditions remain rugged at lower elevations.

Weather Summary

Wednesday night

Cloudy with flurries bringing up to 5 cm of new snow to higher elevations, light rain below about 1400 m. 5 to 15 km/h southeast alpine wind shifting southwest. Freezing level steady around 1400 m.

Thursday

Cloudy with isolated wet flurries at higher elevations, light rain below about 1500 m. 10 to 20 km/h southwest alpine wind. Treeline temperature around -1 °C with freezing level to 1500 m.

Friday

A mix of sun and cloud. 30 to 40 km/h southwest alpine wind, increasing. Treeline temperature around 0 °C with freezing level to 1600 m.

Saturday

Cloudy with flurries bringing 5-10 cm of new snow, including overnight amounts. 35-40 km/h southwest alpine wind. Treeline temperature -3 C with freezing level to 1300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • Wind slabs may be poorly bonded to the underlying crust.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.