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Avalanche Forecast

Archived

Apr 1st, 2023–Apr 2nd, 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.

Clouds with light snowfall should discourage heating through the start of next week with minimal natural avalanche activity expected.

We continue to avoid thin snowpack areas where a large avalanche could be triggered on the basal weakness.

Confidence

Moderate

Avalanche Summary

No new avalanches observed or reported today.

Snowpack Summary

A few cm of new snow buries sun crusts to ridgetop and temperature crusts below 1500m.

The March 25 interface is down 5 to15 cm while the March 12 interface is down 15 to 30cm. Both of these are represented by crusts on solar aspects and facets on shaded slopes.

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

Saturday evening a low over the Prairies will maintain cloud and flurries as winds shift to the NW at 30km/h. Snowfall amount: 5-10 through midday Sunday.

By Sunday afternoon the low will drive an upslope push as winds shift NE and diminish. Snowfall amounts will likely favour the eastern slopes and range from 5-15cm through Monday morning.

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.