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Avalanche Forecast

Archived

Apr 1st, 2023–Apr 2nd, 2023

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

Regions

Jasper, Brazeau, Churchill, Cirrus-Wilson, Fryatt, Icefields, Maligne, Marmot, Miette Lake, Pyramid.

Cooler temps, cloud cover, and a trace of new snow will put the spring feeling on hold for the next few days.

Deep persistent slabs may still be reactive to human triggers in shallow snowpack areas.

Confidence

Moderate

Avalanche Summary

No new avalanche activity reported over the past four days.

Don't forget to post avalanche observations to the MIN.

Snowpack Summary

Sun crust at all elevations on solar aspects. Facets on polar aspects with unsupportive pockets in shallow snowpack areas. The middle of the snowpack consists of multiple layers of dense wind-affected snow, sun crust, and facets. Depth hoar and basal facets make up the base of the snowpack. Snow depth varies ranges from 60-170cm.

Weather Summary

Up to 15 cm of snow forecast by Monday. Light westerly winds switching to northerly, freezing levels at valley bottom, alpine high of -6 C on Sunday.

Terrain and Travel Advice

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Problems

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.