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Avalanche Forecast

Archived

Apr 13th, 2023–Apr 14th, 2023

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

Regions

Little Yoho.

The biggest concerns in Little Yoho are storm slabs which are still likely for human triggering, as well as any solar heating.

Confidence

Moderate

Avalanche Summary

We have just come out of an avalanche cycle to size 4 with many avalanches running to valley bottom. Avalanche control Thursday on Mt. Bosworth produced avalanches up to size 2.5. No other avalanches occurring in the last 24 hours were reported in the Little Yoho region.

Snowpack Summary

Recent storm snow has settled to around 30cm above 2300m. This lies over previous surfaces such as sun crusts up to ridge top and faceted layers on shady aspects. Below 2300m, surface crusts lie over a fairly isothermal snowpack due to previous rain.

Several buried crusts are in the top 50-60 cm on solar aspects. The basal depth hoar is present but is only a concern in thin areas.

Weather Summary

Friday: As the day warms up expect convective flurries up to 5cm in some locations along the front ranges. Winds will be light from the East with freezing levels 1700-1900m.

Saturday: Starting sunny and clouding over in the afternoon. Winds will be increased from the SW and freezing levels to 2000m.

Click here for more info.

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.