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Avalanche Forecast

Archived

Mar 7th, 2019–Mar 8th, 2019

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

Regions

Cariboos.

Wind slabs are likely to be encountered at upper elevations and may be reactive to human triggering, especially in lee features.

Confidence

Moderate -

Weather Forecast

THURSDAY NIGHT - Mainly cloudy with isolated flurries, up to 5 cm / west winds 10-20 km/h / alpine low temperature near -11FRIDAY - Mainly cloudy with isolated flurries / west winds 10-20 km/h / alpine high temperature near -10SATURDAY - A mix of sun and cloud / northwest winds 10-15 km/h / alpine high temperature near -10SUNDAY - A mix of sun and cloud / northwest winds, 10-15 km/h / alpine high temperature near -7

Avalanche Summary

No new avalanches have been reported in the region over the past few days, but observations in neighbouring regions have shown small (size 1) wind slabs reacting to skier traffic at upper elevations. Avalanche activity on the mid January persistent weak layer has tapered off, however test results still suggest that this layer could be triggered by humans in isolated terrain features such as steep cutblocks, and large, steep, open glades. This weak layer has become a low likelihood/high consequence scenario. Check out a recent MIN report from Allen Creek here that illustrates this.

Snowpack Summary

5-10 cm of new snow sits on wind slabs, facets (sugary snow), and surface hoar (feathery crystals) and a crust on sun exposed slopes. The buried wind slabs are also sitting on facets and they may continue to be reactive. At lower elevations, a weak layer buried in mid January can be found approximately 50-60 cm deep. This layer consists of surface hoar and facets, and may be combined with a crust on south facing slopes. This layer has been most reactive at treeline and below treeline. The lower snowpack is generally considered to be strong, except for shallow, rocky areas where cold temperatures continue to facet (weaken) the snowpack.

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.