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Avalanche Forecast

Archived

Apr 8th, 2018–Apr 9th, 2018

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

Regions

South Coast.

Expect changing weather on Monday: light precipitation in the morning, increasing freezing levels, and afternoon sun breaks. These will weaken the snow surface over the day. Observe for signs of instability before travelling into avalanche terrain.

Confidence

Moderate -

Weather Forecast

MONDAY: Mostly cloudy with light precipitation in the morning and afternoon clearing, light southerly winds, treeline temperature 1 C, freezing level 1500 m rising to 2500 m by the late afternoon.TUESDAY: Mostly cloudy with afternoon rain, accumulation 20 mm, strong southerly winds, treeline temperature 4 C, freezing level 2600 m dropping to 1500 m over the day.WEDNESDAY: Mostly cloudy with light precipitation, accumulation 15 mm rain at lower elevations and 15 cm snow at higher elevations, light southerly winds, treeline temperature 0 C, freezing level 1400 m.

Avalanche Summary

We have received very little information on avalanche activity for this region. From the little we have heard, it was generally easy to initiate large wet loose avalanche in steep terrain below treeline on the weekend. We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Around 40 to 100 mm of rain fell on the snowpack up to around treeline between Thursday and Sunday, with precipitation as snow at alpine elevations and possible at treeline too. In higher terrain, snowfall has created new storm slabs. This snow overlies a thick crust in most areas except for possibly shady aspects in alpine terrain. The snowpack below the crust is generally strong.Below treeline and possibly treeline elevations, a spring snowpack exists. The rain saturated and weakened the upper snowpack. The wet snow may freeze at higher elevations with cool temperatures. The mid and lower snowpack are strong.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.