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Avalanche Forecast

Archived

Dec 13th, 2012–Dec 14th, 2012

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

Regions

Cariboos.

Confidence

Fair - Due to limited field observations

Weather Forecast

Light accumulations are expected till tomorrow morning with South West and North West moderate winds. The Western part of the region will see most of these precipitations. Sunny periods are still expected for Friday with seasonal temperatures throughout the period (-8 C) and light winds from the North West.  The upper trough arriving on Saturday should bring light to moderate precipitations on the regions, again, with Westerly upslope seeing most of it. Winds should also pick up to reach moderate to strong speeds from the South West. Another system is following for Sunday, its timing and intensity remains to see.

Avalanche Summary

No new avalanches were reported for this region. Due to our limited observations for this region at this time, your avalanche observations are welcome at [email protected]

Snowpack Summary

Windslabs should grow slightly tonight in specific areas (Easterly aspects) in the alpine and at treeline with the forecasted light precipitations, moderate winds and the older snow available for transport.  The new snow is also burying some older slightly deeper windslabs in sheltered areas. Overall, the top and mid-snowpack is reported to be settling well. The deep persistent instabilities (surface hoar and early November crust) located in the middle and near the bottom of the snowpack are still a concern in this region, however, it is important to know that we have very limited observations for this region at this time.  Digging down and making your own observations will be critical to safe slope selection. Any observations from the field are welcome at [email protected]. 

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.

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.