Yukon Avalanche Forecast

Issued: Mar 11th, 2020 5:00PM

Thu Mar 12th Current Conditions
Alpine Considerable Treeline Moderate Below Treeline Below Threshold
Fri Mar 13th 2 Day Outlook
Alpine Moderate Treeline Moderate Below Treeline Below Threshold
Sat Mar 14th 3 Day Outlook
Alpine Moderate Treeline Low Below Treeline Below Threshold

The alpine rating is considerable, the treeline rating is moderate, and the below treeline rating is below threshold. Known problems include Wind Slabs.

Recent new snow has been redistributed by light to moderate south then strong north winds. The new snow is now obscuring previous widespread wind effect. Wind slabs continue to be the main concern.

Summary

Confidence

High - Confidence is due to a stable weather pattern; little change is expected for several days.

Weather Forecast

WEDNESDAY Night: Mainly clear. Light to moderate north wind. Alpine temperature around -21. 

THURSDAY: Sunny. Light to moderate north wind. Alpine temperature around -19.

FRIDAY: Sunny. Moderate to strong north wind. Alpine temperature around -13.

SATURDAY: Mainly sunny. Light northwest wind. Alpine temperature around -5.

Avalanche Summary

There are no new reports of avalanche activity over the past few days.

Snowpack Summary

Tuesday night saw about 10-15 cm of new snow combined with another 5-15 cm of new snow that fell on Monday and has been redistributed by light southerly winds switching to strong from the north. Expect to see widespread wind effect from the latest north winds. This snow now obscures widespread wind effect from last week's extreme wind event. There may be lingering and buried wind slabs in areas we traditionally think of as sheltered.

At White Pass the snowpack is roughly 200 cm thick with a strong mid and lower snowpack. Thin snowpack areas further inland may have a shallower snowpack composed of sugary faceted grains. Lower elevations may have a melt freeze crust near the surface.

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Watch for areas of hard wind slab on alpine features.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Possible-Likely

Expected Size

1 - 2

New snow from Monday and Tuesday night combined with south switching to north winds has promoted new wind slab formation in the lee of terrain features. This new snow is obscuring wind slabs that formed on all aspects and elevations during a wind event late last week.

Aspects:

All aspects.

Elevations:

Alpine, Treeline.

Valid until: Mar 13th, 2020 4:00PM