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Avalanche Forecast

Archived

Mar 27th, 2021–Mar 28th, 2021

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

Regions

Kootenay Boundary.

New snow and wind arriving Sunday through the day will make wind slabs the main concern.

Confidence

High - The snowpack structure is generally well understood.

Weather Forecast

SATURDAY Night: Mainly cloudy with isolated flurries, moderate to strong southwest wind, treeline temperature -2 C, freezing level 1500 m.

SUNDAY: Cloudy with flurries, accumulation 5-10 cm, moderate to strong southwest wind, treeline temperatures around -2 C, freezing level 1500 m

MONDAY: Mix of sun and cloud, light to moderate northwest wind, treeline temperatures around -5 C, freezing level 1000 m.

TUESDAY: Mix of sun and cloud, light northwest wind, treeline temperatures around -3 C, freezing level 1400 m.

Avalanche Summary

There were no reports of avalanche activity on Friday. On Thursday there were a few reports of human triggered thin storm slab avalanches to size 1.5 on north and south aspects around 2200 m.

Snowpack Summary

10 to 20 cm of snow accumulated through the last week. This overlies a melt-freeze crust on southerly aspects, perhaps small surface hoar crystals on shaded aspects, and otherwise 20 cm of snow from the weekend. This recent snow has generally been stabilizing, but there could be some wind slabs that linger at higher elevations. All of this recent snow sits above a widespread crust, with the exception of high north-facing terrain. 

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.

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.