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Avalanche Forecast

Archived

Feb 21st, 2017–Feb 24th, 2017

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

Regions

Waterton Lakes.

Get out and enjoy the snow, but don't let the good conditions and a lack of signs of instability at lower elevations lull you into complacency.

Weather Forecast

Wednesday: Mostly Clear, Freezing Level Surface, Alpine Low -12, Light to Moderate West Wind.Thursday: Cloudy, Flurries (2-5cm expected), Alpine Low -15, Wind Light North switching to Southwest.Friday: Cloudy, Flurries (1-3cm expected), Alpine Low -17. Light Southwest Wind.

Snowpack Summary

Below Treeline 10-20cm of new snow overlies a strong melt-freeze crust.At Treeline and in the Alpine up to 50cm of snow has fallen since February 18th. This overlies a melt-freeze crust on solar aspects and old wind slabs elsewhere. Below this, the snowpack depth is highly variable as a result of numerous wind events.

Avalanche Summary

No new avalanches have been observed or reported.

Confidence

Due to the number of field observations

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.