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Avalanche Forecast

Archived

Nov 24th, 2013–Nov 25th, 2013

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

Regions

Cariboos.

The forecasts are based on limited observations. Have you been playing in the mountains? Feel free to send your information to [email protected].

Confidence

Poor - Due to the number of field observations

Weather Forecast

An upper ridge of high pressure will remain over the Interior regions. At higher elevations (1600-2800m) a temperature inversion will persist through Tuesday and be pushed out by Wednesday. Monday: May receive light snow amounts. Mainly cloudy. Alpine temperatures near 0 degrees. Freezing levels rising to 2500 m. Light-moderate ridgetop winds from the southwest. Tuesday: Mix of sun and cloud. Alpine temperatures -2. Freezing levels 1500 m. Light westerly ridgetop winds.Wednesday: Mix of sun and cloud. Alpine temperatures -3. Freezing levels dropping to 1200 m. Light westerly winds.

Avalanche Summary

Recently no new avalanches have been reported. However, isolated large slab avalanches may still be rider triggered, especially in areas that didn't previously avalanche.

Snowpack Summary

Snowpack depths at upper elevations sit near a metre or more. Recent storm snow seems to be settling, but wind slab problems likely exist.A surface hoar layer may exist 60-120 cm down but seems to be spotty, and drainage specific. Have you seen any?Deeper in the snowpack near the base is a melt-freeze / rain crust that formed in October. This is generally found from 80-160 cm down near the base of the snowpack. On northerly aspects a more predominant crust/ facet combo may exist and allow for wider propagations. especially in places that have smooth ground over (glacier ice, grassy slopes, rock slabs etc.)Snowpack conditions may change and deteriorate if temperatures rise in the alpine.

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.

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.