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Avalanche Forecast

Archived

Jan 17th, 2021–Jan 18th, 2021

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

Regions

Glacier.

The park is busy! Be cognizant of groups around you.

The recent storm snow has gained strength, however uncertainty remains with the Jan 10 SH interface.

Weather Forecast

A cold front from the North Rockies to the South Coast will weaken and move across southeast BC today.

Today: Isolated flurries, 5cm. Freezing level 1200m. Winds W- 20 km/h gusting to 45

Tonight: Mainly cloudy with trace of snow. Freezing level 800m. Winds W- 20 to 40 km/h

Monday: Cloudy with sunny periods. Freezing level 800m. Winds NW- 10 to 20 km/h

Snowpack Summary

Up to 10cm overnight covers a thin surface crust on steep solar aspects. The Jan 10 surface hoar is down 35-65cm in sheltered terrain at treeline and below and is capped by a thin freezing rain crust in some locations. The Dec 7th surface hoar/crust/facet layer is down 1.5m. Crusts with facets persist at the base of the snowpack.

Avalanche Summary

No new avalanches observed in the past 2 days. On Thursday, field team members remotely triggered a size 1 slab on Jan 10 surface hoar at 1900m in the west end of the park, and the Lone Pine path glide crack on Mt Tupper released to ground size 3.

Confidence

Due to the quality of field observations

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.

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.