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Avalanche Forecast

Archived

Nov 28th, 2015–Nov 29th, 2015

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Kootenay Boundary.

Warming forecast for the next few days will increase the Avalanche Danger, especially at higher elevations.Special thanks to the folks in Nelson and Kootenay Pass for their awesome MIN reports. You rock!

Weather Forecast

A dry ridge of high pressure will continue to bring clear skies and valley fog to the region for the forecast period. The strong inversion will continue until Monday with alpine temperature hovering at around 5' celcius while valley temperatures will remain well below freezing. Ridgetop winds should remain light to moderate from the northeast.

Avalanche Summary

No new avalanches have been reported. This may speak to the lack of observations rather than actual conditions. Given the combination of solar radiation and warm temperatures at higher elevations, there has likely been a round of loose wet avalanche activity on steep, sun-exposed slopes.

Snowpack Summary

At treeline elevations, the snowpack appears to typically be 1-1.5m deep. Current snow surfaces likely include a mix of stubborn wind slabs in exposed higher elevation terrain, loose faceted snow and surface hoar in sheltered areas, and (depending on the time of day) moist snow or a re-frozen crust on steep solar aspects. In some parts of the region a thick hard crust is reported to exist just below the surface. For the time being, this hard crust is likely adding significant strength to the snowpack. That said, the combination of facets and surface hoar overlying a hard crust could become a reactive weak layer if it ever gets buried by new snow. There is also a thick crust from early-November in the middle of the snowpack. The limited reports we have received suggest that this crust is well bonded but you should investigate the snowpack in your local area before committing yourself to avalanche terrain. In general, there is a lot of uncertainty regarding snowpack structure throughout the region. If you have any observations to share, please submit them to our Mountain Information Network.

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.