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Avalanche Forecast

Archived

Mar 4th, 2021–Mar 5th, 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 unlikely, human triggered possible.
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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Spring is in the air, with warm temperatures and high freezing levels. Avoid solar aspects this afternoon; paths like frequent flyer are likely to avalanche today.

Wind slabs are still lurking, and can have serious consequences in the wrong terrain!

Weather Forecast

It's going to be a hot sunny day for Rogers Pass! The freezing level is forecast to rise to 2200m, with clear skies and no precip. The only cooling weather factor today might be the wind, as its forecasted to be 20km/h, gusting to 50km/h. Clear tonight, Fl dropping to 1300m, and winds gusting to 60km/h. Friday will be warm too, but with flurries.

Snowpack Summary

Recent strong to extreme winds left behind a variety of wind slabs in the Alpine and exposed areas of TL. The surface snow turned moist yesterday at lower elev on all asp, and higher on solar asp. Strong solar input today will destabilize the upper snowpack again. The February facet layer is buried 80cm to 1+m, depending on asp & elev.

Avalanche Summary

A significant skier accidental size 3 wind slab occurred yesterday in the Grizzly Couloir, click here for details. Another skier accidental size 1.5 occurred on Mcgill Shoulder yesterday; below tree line on a west asp, click here for more details. In the HWY corridor, Lens path went size 3, starting in extreme terrain on a solar asp.

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.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.