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Avalanche Forecast

Archived

Apr 25th, 2015–Apr 26th, 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.

Improved ski quality on North aspects due to 10-15cm of recent snow. Leave early and end early to avoid afternoon solar avalanche activity. SH

Weather Forecast

Freezing levels to valley bottom on Sunday morning and up to 2300m in the afternoon. A few cm are possible at upper elevations Sunday afternoon with a mix of sun and cloud. Monday and Tuesday the freezing levels will increase significantly.

Snowpack Summary

10-15cm of new snow in the high alpine from a brief storm on Friday. Isolated and small wind slabs were reported in lee alpine areas of the Wapta on Friday. Firm crusts up to 10 cm thick remain intact at most elevations below the new snow.

Avalanche Summary

No new avalanches were reported Saturday.

Confidence

Problems

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.

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.