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Avalanche Forecast

Archived

Apr 21st, 2022–Apr 22nd, 2022

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

South Coast.

20-30 cm of new snow has formed fresh storm slabs at treeline and above. 

 Use small low consequence slopes to test the bond of the new snow. 

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

Thursday night: Partly cloudy / Light southwest wind / Low of 1 / Freezing level 1100 m.

Friday: Mix of sun and cloud / Light west wind / High of 9 / Freezing level 1600 m.

Saturday: Mix of sun and cloud / Light southwest wind / High of 10 / Freezing level 1800 m.

Sunday: Cloudy / Moderate southeast wind / High of 10 / Freezing level 1700 m.

Avalanche Summary

No avalanches were reported in this region on Wednesday.

We currently have very limited avalanche observation data from this region.

Please consider posting your observations to the Mountain Information Network (MIN). Photos of current conditions and avalanches are the most helpful. 

Snowpack Summary

20-30 cm of new snow has formed fresh storm slabs at treeline and above. Lingering wind slabs that were formed earlier in the week may remain reactive in isolated locations at treeline and above.

The recent snow is sitting on a variety of hard snow surfaces, including crusts and wind scoured snow. 

Below this, there are several crusts in the upper snowpack that may have the potential to produce large avalanches during the next significant warming event.

Terrain and Travel

  • Start on smaller terrain features and gather information before committing to bigger terrain.
  • Be careful as you transition into wind affected terrain.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Caution around slopes that are exposed to cornices overhead.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.