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Avalanche Forecast

Archived

Mar 24th, 2014–Mar 25th, 2014

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

Regions

Little Yoho.

Make sure you know the definition of Moderate danger (click on the plus symbol to the right of the danger rating). Avalanche activity has subsided, but if you manage to trigger one from a thin spot, it will be very large.

Weather Forecast

Tues: cold and clear with clouds moving in in the afternoon and freezing levels rising to around 1800m. Snow should start late Tues night and we may see 20-30cm by Wed night. Winds will be light to moderate from the SW throughout, switching to S with the storm on Tues night. Thurs: light snow and gradual clearing as the system passes

Snowpack Summary

30-60cm of storm snow with little wind effect is bonding well. A surface sun crust was formed today on solar aspects. E of the divide, the Mar 13 sun-crust/facet layer is down 30-60 cm on S aspects, and the Feb 10 crust/facet layer is down 60-100cm and still whumphing in thin areas. W of the divide, the Feb 10 is deeper (80-150cm) and less reactive

Avalanche Summary

No new avalanches observed or reported today in the forecast region. However, a few large skiier triggered avalanches in the Columbias and K-Country over the last couple days have been surprising professionals and indicate that the weak layers still exist and can be triggered by humans in specific areas.

Confidence

Forecast snowfall amounts are uncertain

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.