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Avalanche Forecast

Archived

Apr 4th, 2023–Apr 5th, 2023

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

The snow quality on shaded aspects (north and east) is good, but lots of surface crusts exist on the sunny slopes (south and west). No significant avalanches reported in the past 24 hours. Good ski quality and cool temperatures should make for an excellent day on Wednesday.

Confidence

Moderate

Avalanche Summary

No avalanches were observed or reported today.

Snowpack Summary

Accumulated storm snow from the last 3 days amounts to as much as 20cm. This overlies sun crusts to ridgetop and temperature crusts below 1500m. The mid-pack in this area is generally strong, although the base of the snowpack consists of weak facets in thin areas (<2 m).

Weather Summary

A building ridge of high pressure will give us another day of mostly clear skies with some clouds and the odd flurry here and there (no accumulation). Temperatures will remain cool with valley bottom highs reaching only +1 and light winds. Spring is not here quite yet, but look for temperatures and freezing levels to rise starting on Friday.

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.