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Avalanche Forecast

Archived

Jan 31st, 2025–Feb 1st, 2025

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

Regions

Little Yoho.

The Little Yoho region is expected to receive the most snow from this system, with 20-30 cm forecast by Sunday. This new snow may bond poorly to the old faceted surface snow. Careful assessment of storm snow amounts is crucial before committing to avalanche terrain.

Confidence

Moderate

Avalanche Summary

No new slab avalanches were observed or reported on Friday. Local ski hills have primarily reported loose dry avalanche activity, typically triggered by ski cuts.

Snowpack Summary

15-30 cm of new snow has arrived with more expected. The layer being buried is a mix of crust, surface hoar and facets, we do not expect the new snow to bond well to these old surfaces. The mid and lower snowpack is well settle with snowpack depths at tree line ranging from 120cm - 180cm.

Weather Summary

A westerly flow will continue to bring precipitation to the forecast region over the weekend, with an additional 10 to 30 cm of snow expected by Sunday. Moderate to strong winds will accompany the new snow at ridge crests. Temperatures will gradually cool as an arctic air mass moves in, and by early next week, temperatures will plummet, with nighttime lows approaching -30°C.

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.