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Avalanche Forecast

Archived

Apr 14th, 2018–Apr 15th, 2018

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

Regions

South Coast.

Expect new slabs from the recent snowfall. Observe for slab properties and the bond with the snow below before committing into avalanche terrain. The sun may shine, which will weaken the snow and increase the likelihood of triggering avalanches.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

SUNDAY: A mix of sun and cloud, light northeast winds, treeline temperature 0 C, freezing level 1400 m.MONDAY: Cloudy with snowfall, accumulation 10 to 15 cm, light west winds, treeline temperature -2 C, freezing level 1100 m.TUESDAY: Mostly cloudy, light west winds, treeline temperature -2 C, freezing level 1200 m.

Avalanche Summary

We have received very little information on avalanche activity for this region.  From the little we have heard, skiers could easily trigger small loose wet avalanches on Friday.  The rain at lower elevations and snow at higher elevations should mean that the likelihood of triggering avalanches is on the rise.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

Up to 45 mm of rain fell at lower elevations on Friday night.  Some or all of this precipitation likely fell as snow at higher elevations, building reactive storm slabs that sit on a thick crust.Below tree line, a spring snowpack exists. Rain has saturated the upper snowpack. Forecasted rain will continue this trend.

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.