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Avalanche Forecast

Archived

Apr 20th, 2019–Apr 21st, 2019

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

Regions

South Coast Inland.

The likelihood of loose wet avalanches will increase though the day as sun and temperatures warm the snowpack. Lingering wind slabs may lurk around cornices and steep, lee features in the alpine.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

SATURDAY NIGHT: Clear skies, light to moderate southwest wind, alpine temperature -2 C, freezing level below 1400 m

SUNDAY: Mix of sun and clouds, moderate southwest wind, alpine temperature -1 C, freezing level 1900 m.

MONDAY: Mostly cloudy with isolated flurries, trace to 10 cm falling through the day, moderate southwest wind, alpine temperature 0 C, freezing level 2100 m.

TUESDAY: Cloudy with sunny periods and isolated flurries, light to moderate southwest wind, alpine temperature +2 C, freezing level 2100 m

Avalanche Summary

There were no avalanche reports available for the region. The neighbouring Sea To Sky region observed a natural loose wet avalanche cycle during Thursday and Fridays storm. Cornice control work on Friday triggered cornices to size 2 and produced wet slab avalanches to size 2 on the slopes below.

If you have any recent observations during your travels, we would greatly appreciate it if you posted a photo or any other information to the Mountain Information Network (MIN). Thanks!

Snowpack Summary

Around 20 mm of precipitation fell as rain below 2000 m and snow above. A crust has developed on most aspects expect for high alpine slopes where up to 10 cm loose dry snow accumulated. Strong south winds have developed cornices and wind slabs. The snowpack below treeline is saturated and rapidly melting.

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.