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Avalanche Forecast

Archived

Mar 18th, 2024–Mar 19th, 2024

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

Regions

Banff Yoho Kootenay, Little Yoho, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

Forecasted cooler temperatures and cloud cover will improve conditions (unfortunately not the ski quality).

Confidence

Moderate

Avalanche Summary

Although little activity was observed or reported, today likely marked the tail end of the warm weather. The ski areas reported isothermal snow conditions below treeline. Sunshine patrol reported ski-cutting size 1 loose wet avalanches in the afternoon.

Snowpack Summary

Moist snow up to 2600m on all aspects and higher on solar aspects. Only high north aspects hold dry snow. 40-90 cm of settled snow overlies weaker facets above the Feb 3 interface which is a crust up to at least 2500 m. The base of the snowpack consists of weak facets. Deeper snowpack areas (west of the divide) are more settled and dense.

Weather Summary

The high-pressure system will leave the area tomorrow followed by increasing cloud and cooling temperatures. A few centimeters is expected by the end of the day tomorrow. The wind velocity will be variable between moderate and strong, from the West. More snow is expected in the following days.

For more details on the weather, click here.

Terrain and Travel Advice

  • Uncertainty is best managed through conservative terrain choices at this time.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.