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Avalanche Forecast

Archived

Jan 21st, 2019–Jan 22nd, 2019

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

Regions

Sea To Sky.

Moderate danger means that it is possible for humans to trigger avalanches in specific areas. Use caution in wind-affected terrain, where wind slabs may still be present.

Confidence

High -

Weather Forecast

MONDAY NIGHT: Mostly cloudy, freezing level below valley bottom.TUESDAY: Cloudy with light snowfall, accumulation 5 cm, light to moderate southwest winds, alpine temperature -6 C, freezing level 700 m.WEDNESDAY: Cloudy with early-morning snowfall then clearing, accumulation 10 to 20 cm, moderate west winds, alpine temperature -4 C, freezing level rising to 1500 m in the late afternoon.THURSDAY: Mix of sun and clouds, light northwest winds, alpine temperature 0 C, freezing level 2500 m.

Avalanche Summary

Avalanche activity quieted down on Sunday, with skiers and explosives triggering a few small (size 1) wind slabs in lee features at treeline and in the alpine. On Friday and Saturday, many small to large (size 1 to 2) slab avalanches within the storm snow were triggered naturally, by skiers, and with explosives. For examples, check out the MIN reports here and here.

Snowpack Summary

Expect to find extensive wind effect in exposed terrain at all elevation bands. Around 20 to 30 cm of recent snow may sit on a sun crust on south aspects and feathery surface hoar in sheltered and shaded areas. You may find deeper snow deposits in wind-loaded terrain features.Below this, 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.