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Avalanche Forecast

Archived

Apr 21st, 2019–Apr 22nd, 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 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.

Prolonged solar input today. Avoid solar aspects as the day progresses. Storm slabs have been active in the alpine over the last 48hrs.

Weather Forecast

A mix of sun and cloud today with moderate SW winds and an alpine high of 2C. The freezing level is forecast to rise to 2200m. Monday calls for periods of snow (upwards of 15cm), freezing level of 2200m and SW moderate gusting to strong winds.

Snowpack Summary

A surface crust exists this morning, but expect it to break down by midday. 35 mm of precipitation fell Thurs-Fri, falling primarily as rain up to ~1900 m and accompanied by mod to strong S'ly winds. The snowpack is isothermal BTL and thin areas at TL. Dry snow can still be found on Northerly aspects in the high alpine.

Avalanche Summary

A natural avalanche cycle with numerous size 3-3.5 avalanches occurred Friday in the east highway corridor, primarily from north aspects in the alpine. Many of these avalanches initiated as wet slabs from Friday's rain event.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.