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Avalanche Forecast

Archived

Feb 19th, 2022–Feb 20th, 2022

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

South Coast.

Give the storm snow some more time to bond to the surface below before exposing yourself to bigger terrain features.

Confidence

Moderate -

Weather Forecast

Saturday night: low of -3 at 1200m. Snow ending around midnight. Moderate northwest winds.

Sunday: mix of sun and cloud with no new snow expected. Light northerly winds and a high of -2 at 1200m.

Monday: mostly sunny with no new snow expected. Light northerly winds and a high of -3 at 1200m.

Tuesday: mostly sunny with no new snow expected. light north winds and a high of -8 at 1200m.

Avalanche Summary

We suspect skier triggerable wind and storm slabs will have formed on Saturday.

On Thursday ski cutting produced a few size one loose wet avalanches in steep terrain.

Snowpack Summary

New snow accompanied by westerly winds on Saturday will likely have formed storm and wind slabs.

The mid February crust is down 20 to 40cm and exists on all aspects and elevations.

The late-January melt-freeze crust is now down around 70 cm and is reported to be knife hard and up to 30 cm thick. This crust extends to at least the top of treeline and is generally well bonded to the adjacent snow. 

The middle and lower snowpack are considered well settled and strong.

Terrain and Travel

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Closely monitor how the new snow is bonding to the crust.

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.