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Avalanche Forecast

Archived

Apr 16th, 2019–Apr 17th, 2019

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

Regions

South Coast.

Isolated wind slabs may be found up high. Watch for changing snow conditions when it is raining.

Confidence

High -

Weather Forecast

TUESDAY NIGHT: Cloudy with isolated flurries, accumulation 2 to 5 mm, moderate to strong southwest wind, treeline temperature 0 C, freezing level 1400 m.

WEDNESDAY: Cloudy with light rain, accumulation 2 mm, light to moderate southwest wind, treeline temperature 1 C, freezing level 1600 m.

THURSDAY: Cloudy with rain, accumulation 10 to 20 mm, light to moderate southwest wind, treeline temperature 3 C, freezing level 2200 m.

FRIDAY: Cloudy with rain switching to snow, accumulation 30 mm of rain followed by 5 to 10 cm of alpine snow, strong southwest wind, treeline temperature 3 C decreasing to 0 C, freezing level 2400 m dropping to 1300 m over the day.

Avalanche Summary

No new avalanches were reported on Monday. 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 30 cm of recent snowfall has been blown around by southerly wind, forming wind slabs in exposed terrain. This recent snow overlies a thick melt-freeze crust. This snow surface will likely be moist below 1600 m. The snowpack is rapidly melting below treeline.

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.