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Avalanche Forecast

Archived

Apr 19th, 2025–Apr 20th, 2025

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

Regions

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

Cool weather is expected over the next few days.

Watch for increasing surface concerns into Monday as new snow starts accumulating Sunday.

Overall, avalanche hazard has decreased over the last week, but remember that there are still weak layers of facets and depth hoar in the lower snowpack.

Confidence

No Rating

Avalanche Summary

No new avalanches were observed or reported over the last 48 hours.

Snowpack Summary

Trace amounts of snow accumulated above ~2000m Saturday. Below this, surface crusts exist on solar aspects to ridgetop and on all aspects at treeline and below. On northerly aspects, 10-30 cm dry snow with isolated wind effect in lee areas of the alpine. The March 27 crust is 30-70 cm deep and extends to about 2500m. Below the settled midpack, there are still facets and depth hoar to the ground.

Weather Summary

Cooler weather with clouds will influence the region for the next two days following the passage of Saturday's system.

West winds will return to light speeds overnight with only small potential for precip to follow Sunday. -7C treeline temperatures in the morning with freezing levels climbing to around 2000m.

More Precip can be expected overnight Sunday and into Monday.

Terrain and Travel Advice

  • Even brief periods of direct sun could produce natural avalanches.

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.