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Avalanche Forecast

Archived

Apr 18th, 2019–Apr 19th, 2019

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

A warm, wet storm is barreling down on Rogers Pass today and tonight. Danger ratings will rise rapidly with tonight's forecasted rain and winds.

Weather Forecast

Today will begin snowy, with 10cm accompanied by moderate SW winds. Tonight, the temps will rise rapidly with 20mm of rain, strong SW winds, and freezing levels (FZL) around 2300m. Friday will bring flurries (10cm), strong SW winds, and a slow lowering of the FZL to 2200m. Saturday should be a mix of sun and cloud, FZL at 1800m, and light winds.

Snowpack Summary

Storm snow since Sunday now totals 50cm. Strong southerly winds have created soft slabs in the alpine and exposed areas of tree-line. Storm slabs overlie melt-freeze crusts on all aspects and elevations except N aspects, where slabs sit on surface hoar. Below tree-line, rain and warm temps have prevented a solid crust recovery.

Avalanche Summary

Several size 2 slab avalanches were observed on steep, N-facing alpine terrain from Macdonald yesterday. Sunday, there was a skier remote size 2 triggered on Video Peak. Six people in the area, three involved, no gear lost, no burials, & no injuries. The parties had deviated from the regular ascent route to Video Pk, climbing straight up the face.

Confidence

Problems

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.

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.