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Avalanche Forecast

Archived

Feb 24th, 2019–Feb 25th, 2019

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast Inland.

Careful with slopes that have been wind-loaded and slopes getting hit by the sun.

Confidence

Moderate - Wind speed and direction is uncertain

Weather Forecast

SUNDAY NIGHT: Clear with cloudy periods, moderate northeast wind, alpine temperatures drop to -14 C.MONDAY: Sunny with cloudy periods, moderate northeast wind, alpine high temperatures around -10 C.TUESDAY: Sunny with cloudy periods, moderate to strong northeast wind, alpine high temperatures around -13 C.WEDNESDAY: Sunny with cloudy periods, strong east wind, alpine high temperatures around -8 C.

Avalanche Summary

Preliminary reports from Sunday indicate small (size 1) wind slabs were reactive on south-facing slopes in the immediate lee of ridgetops.On Saturday, several small (size 1) wind slabs were triggered in northern parts of the region. Loose dry sluffing was also reported in steep terrain.On Friday, a size 1.5 wind slab was remotely triggered as a skier approached a steep south-facing slope north of Pemberton. The slab was 10-40 cm deep and had recently been loaded by north winds. On Thursday, a slab avalanche was reported in the Duffey area on northwest aspect at 1900 m (see MIN report here).

Snowpack Summary

Friday's storm delivered 10-15 cm in northern parts of the region and 15-25 cm in southern parts of the region. Recent wind has formed isolated pockets of slabs in exposed terrain, while sheltered areas have cold low density snow. The top 20 to 40 cm of the snowpack consists of low density snow that is gradually settling onto old hard surfaces including crusts and wind-packed snow. Low-density snow may sluff easily on these hard surfaces. In some isolated features, the snow has settled into thin slabs above these hard surface and produced small avalanches with minimal destructive potential. The remainder of the snowpack is generally well-settled.

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.