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Avalanche Forecast

Archived

Jan 31st, 2022–Feb 1st, 2022

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, 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.

Regions

North Rockies.

Start your day with a conservative mindset and assess for how the recent snow is bonding to the snowpack before committing yourself.

Confidence

Moderate - Uncertainty is due to how quickly the snowpack will recover and gain strength.

Weather Forecast

MONDAY NIGHT: Partly cloudy with isolated flurries, accumulation 1 to 3 cm, 20 to 30 km/h northwest wind, alpine temperature -17 C.

TUESDAY: Clear skies with no precipitation, 20 to 30 km/h north wind, alpine temperature -24 C.

WEDNESDAY: Increasing clouds with afternoon snowfall, accumulation 1 to 3 cm, 40 km/h southwest wind, alpine temperature -20 C.

THURSDAY: Cloudy with snowfall, accumulation 5 to 15 cm, 40 to 60 km/h west wind, alpine temperature -10 C.

Avalanche Summary

No recent avalanches were reported. We may receive more reports of observations during the weekend's storm shortly.

Looking forward, human-triggering of avalanches may remain elevated as the new snow starts to bond to the snowpack. It may take longer than expected, particularly where it sits on weak layers described in the snowpack summary.

Snowpack Summary

The weekend's storm brought around 10 to 20 cm of snow to the region with a few hot spots of up to 35 cm in the southwest of the region. The snow fell with strong wind from variable wind directions, forming wind slabs in lee terrain features. In areas sheltered from the wind, the snow overlies weak surface hoar crystals, which may also sit above a melt-freeze crust on sun-exposed slopes.

The lower snowpack is generally strong and well-bonded. The base of the snowpack is expected to be weak in shallow, rocky, wind-affected slopes east of the divide.

Terrain and Travel

  • Avoid freshly wind loaded terrain features.
  • Potential for wide propagation exists, fresh slabs may rest on surface hoar, facets and/or crust.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.

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.