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Avalanche Forecast

Archived

Dec 8th, 2020–Dec 11th, 2020

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

Regions

Waterton Lakes.

New snow on Wednesday will hide some of the stumps and rocks still poking through our thin, early season snowpack.

Weather Forecast

Wednesday- Freezing level 1800m. 5-10mm of precipitation. Light West wind.

Thursday- Freezing level dropping to valley bottom. Moderate West wind  Mix of sun and cloud with a clearing trend in the afternoon. No precipitation.

Friday- Freezing level remaining at valley bottom. No precipitation.

Snowpack Summary

Wind has scoured SW aspects to ground the alpine. A melt freeze crust is expected to form on solar aspects as freezing level drops with incoming storm on wed. Northerly aspects above 2000m have a wind slab sitting over a old melt freeze crust. 80cm of snow at Cameron Lake @2000m. Less than 20cm in rest of park. Below threshold at lower elevations.

Avalanche Summary

No new avalanches observed.

Confidence

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 Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.