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Avalanche Forecast

Archived

Jan 24th, 2022–Jan 25th, 2022

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

Regions

North Rockies.

Identify features of concern where wind slabs will likely be more prone to triggering, such as convex, steep and unsupported features. 

Confidence

High - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

MONDAY NIGHT: Cloudy with clear periods / Moderate southwest wind / Low temperature of -5 / Freezing level at valley bottom.

TUESDAY: Mix of sun and cloud / Gusty increasingly strong west wind / High temperature -4 C / Freezing level at 1000 m.

WEDNESDAY: Cloudy with flurries / Moderate northwest wind gusting 50 km/h / High temperature -4 C / Freezing level at 800 m.

THURSDAY: Mix of sun and cloud / Light southwest wind / High temperature -4 C / Possible temperature inversion / Freezing level at 1000 m.

Avalanche Summary

No new avalanches were reported in the last 24h. 

On Saturday, wind slab avalanches to size 1.5 were reactive to riders and explosives triggered avalanches to size 2, avalanches were 20-40 cm deep and found in lee areas from westerly winds. Some small avalanches that were naturally triggered by falling cornices have also been reported.

Snowpack Summary

Winds have stiffened 20-35 cm recent snow in open areas at treeline and throughout the alpine. Gusty winds may have loaded terrain further down slope than usual. Cool overnight temperatures have produced a surface crust up to 1500 m and on steep solar slopes. See our field team photos from Anzac on Sunday.

The recent snow covered a thin crust up to 1650 m, this was the suspected surface in recent wind slab avalanches. Another crust is found down 70 cm, but has not shown recent reactivity. The lower snowpack is generally strong and bonded, with one or multiple crusts near the ground. We suspect the lower snowpack could be weak in shallow rocky wind-affected slopes east of the divide.

Terrain and Travel

  • Wind slabs may be poorly bonded to the underlying crust.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.
  • Seek out sheltered terrain where new snow hasn't been wind-affected.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.