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Avalanche Forecast

Archived

Feb 21st, 2024–Feb 22nd, 2024

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, North Shore, Sasquatch, Sasquatch, Tetrahedron.

Reactive surface instabilities are likely forming in the highest elevations of the region. Rain continues to erode the snowpack everywhere else.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been observed in this region, but conditions are changing in high alpine locations without many observations as yet.

Looking forward, anywhere snowfall or especially wind transport allows for accumulations greater than about 15 cm will make human triggerable slabs an increasing concern.

Snowpack Summary

Up to 20 mm of precipitation Tuesday brought a suspected 5-15 cm of new snow to the region's highest elevations as rain fell below about 1400 m.

Similar forecast weather on Thursday should make for wet surface conditions in most areas with windblown, likely reactive new snow accumulations in higher alpine locations.

Where new snow is falling, it has buried a mix of crust and wind-affected surfaces.

Below any new snow the remainder of the snowpack is well settled. Conditions remain rugged at lower elevations.

 

Weather Summary

Wednesday night

Cloudy with continuing wet flurries bringing 5-10 cm of new snow to the alpine, diminishing at lower elevations to rain below about 1300 m. 15 to 20 km/h southeast alpine wind. Freezing level steady around 1400 m.

Thursday

Cloudy with continuing wet flurries bringing 5-15 cm of new snow to the alpine, diminishing at lower elevations to rain below about 1300 m. 10 to 25 km/h southeast alpine wind, easing. Treeline temperature 0 °C with freezing level steady around 1400 m.

Friday

Mainly cloudy. 20 to 40 km/h southwest alpine wind, increasing. Treeline temperature 0 °C with freezing level around 1400 m.

Saturday

Cloudy with scattered flurries bringing up to 5 cm of new snow, including overnight amounts. 30-40 km/h west alpine wind. Treeline temperature -2 °C with freezing level falling to 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Wind slabs are most reactive during their formation.
  • Snow is accumulating at higher elevations despite lower elevations being almost snow free
  • Be alert to conditions that change with aspect and elevation.

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.