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Avalanche Forecast

Archived

Jul 10th, 2020–Jul 11th, 2020

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Jasper.

Heightened avalanche hazard can exist in the Alpine all summer particularly after new snowfall. Be informed and prepared. Use the weather stations, Mountain Conditions Report, Mountain Information Network, or call Visitor Safety at 780-852-6155.

Weather Forecast

The mountain weather forecast is a good source for detailed weather (https://avalanche.ca/weather/forecast) . Other sites include Environment Canada, Mountain Weather, and Spot.

Snowpack Summary

Generally, danger increases with daytime warming and decreases with cold nights particularly if it freezes. Snow bridges over crevasses weaken as the snow thins through the summer thus use extra caution when crossing glaciers. Be vigilant for newly formed windslabs and increasing natural avalanche activity.

Avalanche Summary

Activity increases with rising temperatures especially during warm and sunny afternoons. Use caution if the surface has not frozen overnight. Watch for wind slabs in the alpine particularly following fresh snowfall forming above pre-existing crusts. Cornices can be large and dangerous if you get too close to the edge thus avoidance is key.

Confidence

Problems

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.

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.