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Avalanche Forecast

Archived

Nov 3rd, 2020–Nov 4th, 2020

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Warm temps aren't doing our early season snowpack any favors. Ski/ride with caution; rocks, trees, open creeks, etc are desperately trying to trip you up. It's a long season, stay safe!

Weather Forecast

A series of fronts embedded in a strong zonal flow will give warm temps and waves of moderate precipitation until later in the week.

Today: 5-10cm snow (6mm rain), mod SW winds, Alp high of 0°C, fzl 2000m

Tonight: 10-15cm snow (9mm rain), strong SW winds, Alp low -1°C, fzl 1900m

Wed: 20-30cm snow, mod-extreme SW winds, Alpine high 2°C, fzl 2500m

Snowpack Summary

The lower elevation snowpack continues to loose cohesion with above freezing temperatures overnight up to 2200m.  In the alpine, incoming new snow will fall on bare ground in exposed windward features, previous firm surfaces in wind-loaded areas, and a sun crust on solar aspects. A healthy 1.5+m snowpack in the alpine shrinks to 30-40cm at 1300m.

Avalanche Summary

Several small avalanches were reported yesterday from steep solar aspects.

A major early-season cycle Thursday/Friday produced numerous avalanches up to sz 3 on Tupper, Macdonald, and the N side of Cheops to sz 3; many of these avalanches made it to valley bottom.

Confidence

Due to the number and quality of field observations

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.