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Avalanche Forecast

Archived

Apr 20th, 2015–Apr 21st, 2015

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

Little Yoho.

A very light freeze is forecasted for Monday night, followed by a very warm day on Tuesday. Pay attention to how fast the snow is warming up.

Weather Forecast

Only a light freeze is expected tonight followed by a very warm sunny day on Tuesday. Freezing levels may rise as high as 3000 m. Slightly cooler temperatures with some scattered showers are forecasted for Wednesday.

Snowpack Summary

Supportive crust on solar aspects in morning which are deteriorating by early afternoon. High elevation east and north still have dry snow. Mid and lower pack is well settled with no significant shears.

Avalanche Summary

Loose snow avalanches up to size 1.5 on solar aspects in afternoon.

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.