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Avalanche Forecast

Archived

Apr 5th, 2021–Apr 7th, 2021

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

Steady flurries and wind will make wind slab avalanches possible on steep open slopes this week.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

MONDAY NIGHT: Flurries with about 5 cm of new snow at White Pass, 30-40 km/h southwest wind, treeline temperatures drop to -8 C.

TUESDAY: Cloudy with scattered flurries and another 5 cm of snow, light north wind with some moderate gusts, treeline temperatures around -5 C.

WEDNESDAY: Mostly cloudy with some isolated flurries, light north wind, treeline temperatures around -8 C.

THURSDAY: Cloudy with flurries intensifying throughout the day with 10-15 cm of snow by the evening, 50-70 km/h south wind, treeline temperatures around -5 C.

Avalanche Summary

Over the weekend there were a few reports of natural wind slab avalanches (see a photo in this MIN report) and some size 1 wet loose avalanches on steep sun-exposed slopes. Looking forward fresh wind slabs will be the main concern.

Snowpack Summary

Light accumulations of snow over the past few days with strong southwest wind has likely left pockets of wind slabs in lee terrain features. The White Pass area has a deep snowpack without any layers of concern. The Tutshi Lake / Paddy Peak area should be assessed on a slope by slope basis, as some lingering snowpack weaknesses may still exist on isolated slopes. The Wheaton's shallower snowpack is dominated by hard wind slabs overlying sugary facets and depth hoar. It's an untrustworthy snowpack structure that requires conservative terrain selection and diligent travel habits.

Terrain and Travel

  • Seek out sheltered terrain where new snow hasn't been wind-affected.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.