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Avalanche Forecast

Archived

Jan 2nd, 2021–Jan 3rd, 2021

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

Regions

Little Yoho.

The hazard will depend on how much snow falls overnight into Sunday. If the forecast holds true watch for an increase in triggering potential, and an increase in natural activity, especially if exposed to steep gully features with overhead hazard.

Weather Forecast

Anywhere from 20-30cm of snow is expected at treeline Saturday night into Sunday. The temperatures will be cooler on Sunday AM and cooler again Monday AM. Expect strong winds overnight and through Sunday.

Snowpack Summary

On Saturday the surface snow was soft with isolated areas of wind effect in the alpine. The Dec 13 and Dec 7 sun crust/surface hoar/facet layers are down ~ 50cm and ~80 cm respectively. Height of snow at tree line is 120-200cm.

Avalanche Summary

No new avalanches were reported Saturday. We expect more activity on Sunday with incoming snow and wind.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Sunday

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.