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Avalanche Forecast

Archived

Jan 11th, 2022–Jan 12th, 2022

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

Regions

Yukon.

Ongoing southwesterly winds continue to redistribute the recent storm snow and touchy wind slabs are expected on Wednesday. Be alert to conditions that change with elevation and use extra caution in wind exposed terrain.

Confidence

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

Weather Forecast

Unsettled conditions are expected for Wednesday and Thursday with periods of flurries and periods of sunny breaks both expected. 

Tuesday Overnight: Mainly cloudy with a chance of isolated flurries, moderate SW wind, treeline temperature around -6 °C.

Wednesday: Mainly cloudy with sunny breaks and periods of flurries, moderate SW wind, treeline high around -4 °C.

Thursday: Mainly cloudy with sunny breaks and a chance of flurries, moderate to strong S wind, treeline high around -6 °C.

Friday: Periods of light snowfall, moderate S wind, treeline high around -6 °C.

Avalanche Summary

On Tuesday, the Avalanche Canada field team was able to ski cut reactive wind slabs on steep north aspects at upper treeline. With ongoing moderate SW wind continuing to redistribute the surface snow, wind slabs are expected to remain touchy on Wednesday. 

Snowpack Summary

20-40 cm of recent storm snow has been redistributed by strong southerly winds into fresh wind slabs in exposed terrain. These new wind slabs overlie a heavily wind-affected and faceted snow surface. The new snow will likely bond poorly to the old snow surfaces and newly formed wind slabs may remain reactive to human triggering for longer than normal. Reports from the Avalanche Canada field team include scouring to ground in exposed terrain, particular on north through east aspects from last week's outflow wind event. The height of snow is reported to be extremely variable. Older wind slabs from the outflow wind event last week are expected to have stabilized in most places but uncertainty still exists due to a limited number of recent observations. 

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Sheltered slopes at lower elevations will offer the safest conditions.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.

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.