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Avalanche Forecast

Archived

Jan 2nd, 2025–Jan 3rd, 2025

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

Regions

Little Yoho.

The storm snow from the last week is upwards of 40cm, is remaining low density and beginning to facet, so watch for sluffing out of steep terrain.

If the wind picks up, it will quickly develop windslabs.

Confidence

Moderate

Avalanche Summary

No new avalanches observed or reported from this region on Jan 2nd.

A loose dry cycle occurred 48-72 hours ago.

Snowpack Summary

25-45 cm unconsolidated storm snow has fallen over the past six days, with very little wind. This overlies a 110-130 cm snowpack with a strong mid-pack but a weak crust/facet layer near the ground. The distribution and strength of this layer varies, but conditions in the deeper snowpack of the Little Yoho region are better than areas further east in BYK. With the amount of snow available for transport, expect conditions to change quickly with any wind loading.

Weather Summary

Tonight: Mainly cloudy. 30 percent chance of flurries this evening. Wind west 20 km/h becoming light late this evening. Low minus 16.

Friday: A mix of sun and cloud. Becoming cloudy near noon then snow. Local amount 2 cm. Wind up to 15 km/h. High minus 11.

Saturday: A mix of sun and cloud with 70 percent chance of flurries. High minus 8.

Terrain and Travel Advice

  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Wind slabs are isolated, but may remain reactive.

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.

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.