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Avalanche Forecast

Archived

Mar 31st, 2023–Apr 1st, 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, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Some light snow and cloudy conditions this weekend should minimize any solar effect. We have gone to LOW danger for the weekend, but are still avoiding thin snowpack areas where an unlikely but large avalanche could be triggered on the basal weak layer.

Confidence

High

Avalanche Summary

No new avalanches observed or reported today with minimal solar input.

Snowpack Summary

Surface crusts exist to ridgetop on solar aspects. On shady aspects, 10-25cm of settled snow sits over a facetted interface from March 25th and buried temperature crusts below 1500 m. The midpack in this area is generally strong, although the base of the snowpack consists of weaker facets in thinner areas (<2 m). A field trip today in the area found crusts on all aspects except due North.

Weather Summary

Saturday. Some light snow (~5cm) through the day and 30-40kmh winds. Freezing levels 1600-1800m.

Sunday: Flurries with winds shifting to light from the E/NE later in the afternoon and slightly cooler temperatures.

For a more detailed weather forecast click here.

Terrain and Travel Advice

  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Avoid exposure to steep, sun exposed slopes, especially when the solar radiation is strong.
  • Cornices become weak with daytime heating or solar exposure.

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.