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Avalanche Forecast

Archived

Feb 3rd, 2021–Feb 4th, 2021

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

Regions

Glacier.

Conservative terrain choices is required today. Be wary of steep, unsupported terrain features, and large overhead hazards.

Weather Forecast

A mixed bag of weather can be expected today as a Ridge of High Pressure is trying to move over Rogers Pass, while a Low-Pressure system retreats south of the border. It's currently snowing, but the sun is forecasted to come out today, freezing levels will reach 900m, and winds could reach mod values from the SW. More flurries tonight and tomorrow.

Snowpack Summary

Another 15cm last night, brings our storm total to ~80cm at TL, with the bulk of the precip falling on Monday and Tuesday. The brunt of the storm brought warm temperatures, and strong winds creating touchy storm slabs. The new snow buries a previous drought layer (surface facets, surface hoar, wind affect, and sun crust).

Avalanche Summary

Avalanche Control on Tuesday morning produced numerous avalanches; averaging size 3, several size 3.5s, and a few size 4s! Large natural avalanches were also observed in the HWY corridor to size 3.5. Limited obs from the backcountry; however, its likely there were numerous natural avalanches, Monday evening and Tuesday morning.

Confidence

Due to the number 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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.