Avalanche Forecast
Issued: Jan 17th, 2019 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Deep Persistent Slabs.
snow safety,
Parks Canada
Basal instabilities can result in large avalanches with high consequences. Thinner snowpack areas will be more touchy and prone to avalanche. Make conservative choices.
Summary
Weather Forecast
A weak system will track through the forecast region starting Thursday night, bringing up to 15cm of snow by the end of Saturday. Temperatures will remain on the warm side of seasonal. Alpine winds will increase late friday to the strong range from the SW.
Snowpack Summary
Solar crusts on some steep SE to West slopes at TL. Surface hoar development below treeline. It has become increasingly hard to find midpack instabilities in Yoho. Basal instabilities are common - not quite depth hoar, just large facets and rounded facets. Treeline depths range from 150cm to 200cm.
Avalanche Summary
No avalanches observed or reported today.
Confidence
Intensity of incoming weather systems is uncertain
Problems
Deep Persistent Slabs
The weak facets and depth hoar just above the ground have an significant 100-140cm thick slab sitting above them. This slab has been hardened by wind effect TL and above. Activity is tapering, but human triggering is still possible and consequential.
Be aware of the potential for wide propagations which could result in large avalanches.Be aware of the potential for full depth avalanches due to deeply buried weak layers.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Jan 18th, 2019 4:00PM
