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Avalanche Forecast

Archived

Apr 26th, 2019–Apr 27th, 2019

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

Glacier.

The danger will increase during the day with the powerful sun and warm temps. Cornices are large on ridge-crests and become fragile in the heat.

Weather Forecast

Increasing cloud today, with flurries tonight. Freezing levels (FZL) will rise to 2200m, with light S winds. Snow arrives tonight and continues Saturday, with 15-20cm expected. Winds will be moderate to strong from the SW during the snowfall. FZL will remain near 1400m. Clearing Sunday, with light NE winds and FZL rising to 1800m.

Snowpack Summary

Solar aspects will have a melt-freeze crust this morning. Isothermal snow lives below these surface crusts. Storm snow totalled over 50cm in the high Alpine last week, and N-NE aspects will have retained the driest snow. In certain locations, storm slabs have been reactive down to tree-line.

Avalanche Summary

Several loose, wet avalanches to size 2 were observed from both N and S aspects in the HWY corridor yesterday. A very large size 4 was observed at the south end of the park, starting as a size 2 storm slab and stepping down to glacial ice. Last Saturday, skiers triggered a size 2.5 slide on the Youngs Peak headwall.

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.

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.