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Avalanche Forecast

Archived

Apr 25th, 2019–Apr 26th, 2019

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

Regions

Lizard-Flathead.

Friday's forecast calls for flurries at upper elevations. Check out our Cold and Snowy spring scenario for detailed guidance on managing these conditions.

Confidence

Low - Due to the number of field observations

Weather Forecast

Thursday Night: Mainly cloudy. Light southwest winds. Alpine high temperatures around +1 with freezing levels to 2200 metres.

Friday: Cloudy with flurries bringing 5-10 cm new snow to higher elevations. Rain below about 1700 metres. Southwest winds increasing from light to strong over the day. Alpine high temperatures around 0 with freezing levels to 2000 metres.

Saturday: Cloudy with flurries bringing about 5-10 cm of new snow. Rain below about 1500 metres. Moderate to strong southwest winds. Alpine high temperatures around -2 with freezing levels to 1700 metres.

Sunday: A mix of sun and cloud. Moderate northeast wind. Alpine high temperatures around -3 with freezing levels to 1500 metres.

Avalanche Summary

No new avalanches have been reported in the region. Please submit your observations to the Mountain Information Network.

Snowpack Summary

In most places a combination of rain and warm temperatures has likely made the surface snow moist or wet. High elevation alpine and especially north aspects may still hold dry snow. If there has been a good overnight freeze, you may find a supportive crust on the surface. The mid and lower snowpack pack are likely a mixture of moist snow and crusts. Below treeline the snowpack has melted or is isothermal.

Problems

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.

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.