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Avalanche Forecast

Archived

Apr 17th, 2019–Apr 18th, 2019

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

Regions

Glacier.

High quality powder skiing can be found in the Alpine on North and East aspects. Reactive storm slabs are also be lurking in the Alpine and at Tree Line.

Weather Forecast

Today: Snow ending late this morning then a mix of sun and cloud, snowfall 2-4cm, FL rising to 1900m, and Strong Southerly winds. Thursday: 30cm of new snow in the Alpine, probably 30mm of rain BTL, FL making it to 2400m. Friday: Flurries.

Snowpack Summary

Another 10cm at Mt Fidelity brings our storm total to 45cm since Sunday. Strong South winds overnight created soft slabs in the alpine and exposed areas of treeline. Storm slabs overlie melt-freeze crusts on all asp, and elev, except Nth alpine. Poor cr recovery BTL with the new snow insulating the melt freeze crust, which covers isothermal snow.

Avalanche Summary

No new avalanches have been observed in the HWY corridor, or reported from the back country since Sunday. On 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 that triggered the avalanche had deviated from the regular ascent route to Video Pk.

Confidence

Due to the number and quality of field observations

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.