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Avalanche Forecast

Archived

Apr 26th, 2021–Apr 28th, 2021

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

Regions

Yukon.

The region will see a return to winter this week. New snow does not often bond well to crusts. 

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

MONDAY NIGHT: -2C, winds light S changing to N/NE overnight, increasing clouds, trace amounts of new snow. 

TUESDAY: low -7C high -3, moderate N/NE winds, mostly cloudy, 5cm new snow

WEDNESDAY: low -7C high -1C, light NE winds, mostly cloudy, 5cm new snow

THURSDAY: low -5C high 0C, light N winds, cloudy, 5cm new snow

Avalanche Summary

No new avalanches were observed over the weekend. One new cornice failure was reported. This cornice did not produce a slab avalanche. As new snow arrives this week, the bond between it and the existing hard surfaces should be closely assessed. 

A big THANK YOU to all of you that provided us and fellow recreationists with observations this season. Please continue to do so if you head out!

Snowpack Summary

Very firm snow and crusts are present at all elevations and on all aspects. New snow arriving this week may not bond well to these firm surfaces. These layers can act as an excellent gliding surface for new wind slab or storm slab avalanches in areas of greater accumulation. 

The White Pass area still has a deep snowpack without any layers of concern. A thinner and weaker snowpack exists in inland regions, such as the Wheaton Valley.

Terrain and Travel

  • Avalanche danger is often elevated in alpine gullies where snow has accumulated.

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.