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Avalanche Forecast

Archived

Feb 22nd, 2022–Feb 23rd, 2022

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

Regions

Northwest Coastal.

Wind slabs have been reactive to human triggers in recent days. As you enter wind affected terrain, watch for wind slabs on all aspects especially near ridge crests and roll-overs.

Confidence

High -

Weather Forecast

Tuesday night: Cloudy with flurries bringing a trace, moderate to strong northwest wind, alpine low of -12.

Wednesday: Flurries bringing 5-10 cm, moderate to strong northwest wind, alpine high of -6.

Thursday: Sunny, light northwest wind, alpine high of -3.

Friday: A mix of sun and cloud, light to moderate southwest wind, alpine high of -1.

Avalanche Summary

On Monday, natural size 2.5 wind slab avalanches were reported east of Kitimat. Otherwise, avalanche activity was limited to thin size 1 wind slabs and loose dry sluffing up to size 1.5.

On Sunday, several skiers were surprised by a handful of separate incidents of accidentally and remotely triggered size 2-2.5 (large) storm slabs, including the one reported in this MIN. These avalanches slid on the thick crust beneath the most recent storm snow. At least one was on a previously skied slope.

 

Snowpack Summary

In the alpine, 30-50 cm of recent, variably wind-affected snow appears to be bonding poorly to the underlying crust. A surface crust exists at elevations below 1300 m.

The 10-30 cm thick rain crust beneath the recent snow effectively caps the underlying snowpack, making human triggering of avalanches on deeper weak layers very unlikely.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Wind slabs may be poorly bonded to the underlying crust.

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.