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Avalanche Forecast

Archived

Apr 19th, 2019–Apr 20th, 2019

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

Regions

Glacier.

Heavy rains overnight have destabilized the snowpack. A widespread avalanche cycle is underway. Avoid all avalanche terrain until the weather cools off!

Weather Forecast

A further 20mm of rain will fall today to 2200m before freezing levels (FZL) drop below 2000m by the evening. Winds will remain moderate to strong from the SW. Saturday will be a mix of sun and cloud, with light NW winds and FZL around 2000m. Sunday should be sunny with FZL rising to 2400m and light winds.

Snowpack Summary

Overnight, 25mm of rain to ridge-top has saturated the upper snowpack. There has been no crust recovery at tree-line and below. The isothermal snowpack will be failing to ground below tree-line today.

Avalanche Summary

A natural avalanche cycle to size 3 off of Macdonald and Tupper is currently underway. Numerous paths have run to the bottom of their fans and have dug right down to ground.

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.