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Avalanche Forecast

Archived

Nov 8th, 2019–Nov 9th, 2019

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

Regions

Jasper.

Early season hazards such as rocks and vegetation lurk under a shallow weak snowpack. Ice climbers are most vulnerable to wet  loose avalanches in gulleys and terrain traps. It is currently raining to mountain top.

Weather Forecast

Tonight will be flurries, 6 cm of snow, Low -3 C, 20 km/h gusting to 45 km/h winds, and freezing level 1600 meters. Saturday will be cloudy with scattered flurries, 4 cm of snow, High -2 C and ridge wind west 15-35 km/h with freezing level 2000 meters. 

A detailed forecast can be found from Avalanche Canada's, Mountain Weather Forecast.

Snowpack Summary

40-70cm sits atop a weak basal crust. Snowpack is moist to the ground with rain and wet snow. Height of snow is variable from zero to 85cm in wind drifted areas. Expect slab development in specific terrain features with incoming precipitation, winds, and high relative humidity. Expect a new crust up to 2400m with rain followed by cold temperatures.

Avalanche Summary

Natural avalanche cycle up to size 2 were mostly loose moist point release on all aspects at treeline. They remain relatively small. One slab release size 2 on Parker Slabs from steep deposition zone showed good propagation likely on the basal crust. Visibility was limited.

Confidence

Freezing levels are uncertain on Saturday

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.

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.