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Avalanche Forecast

Archived

Feb 22nd, 2024–Feb 23rd, 2024

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

Regions

South Coast, North Shore, Sasquatch, Sasquatch, Tetrahedron.

It will take some serious hustle to find dry alpine snow in the region. Be ready to manage deeper, more reactive new snow accumulations around ridgecrests if you make the trek.

Confidence

Moderate

Avalanche Summary

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

Human triggerable slabs are now a concern anywhere snowfall or especially wind transport has allowed for new snow accumulations greater than about 15 cm.

Snowpack Summary

30 - 50 mm of precipitation in the early week brought a suspected 10 - 20 cm of dense new snow to the region's highest elevations as rain fell below about 1400 m.

This has led to wet surface conditions in most areas with windblown, likely reactive new snow accumulations suspected in higher alpine locations.

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

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

 

Weather Summary

Thursday night

Clearing, still partly cloudy. 5 - 15 km/h southwest alpine wind, increasing. Freezing level remaining near 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 southwest alpine wind. Treeline temperature -2 °C with freezing level falling to 1100 m.

Sunday

Cloudy with heavy snowfall bringing 30 - 50 cm of new snow, including overnight amounts. 60 - 75 km/h southwest alpine wind, increasing. Treeline temperature -2 °C with freezing level to 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Carefully evaluate steep lines for wind slabs.
  • 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.