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Avalanche Forecast

Archived

Mar 1st, 2017–Mar 4th, 2017

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

Regions

Waterton Lakes.

There is a lot of low density snow out there for entrainment, small pockets of slab may result in surprisingly large avalanches.

Weather Forecast

Thursday: Cloudy. Snow (5cm). Ridgetop winds Moderate-Strong SW. Alpine Temps: High -7, Low -10.Friday: Mostly Cloudy. Snow flurries. Ridgetop winds Strong SW. Alpine Temps: High -5, Low -8.Saturday: Mostly Cloudy. Snow (10cm) Ridgetop winds Strong trending Light SW. Alpine Temps High -5, Low -10

Snowpack Summary

15cm (and counting) of new snow, accompanied by moderate winds, is forming touchy storm slabs in exposed areas. Below this several layers of soft Wind Slab have been easy to trigger in recent days. Up to 70cm of snow has fallen since Feb. 18th, and remains unconsolidated in many areas, expect significant entrainment if you trigger an avalanche.

Avalanche Summary

Nearby operations reported skier triggering of small Wind Slab and Loose Dry avalanches on Monday and Tuesday.

Confidence

Intensity of incoming weather systems is uncertain

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.

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.

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.