Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Regions
Glacier.
http://www.pc.gc.ca/apps/scond/Cond_E.asp?oID=15974&oPark=100205We are in for some mild sunny weather. It may be tempting to get on some bigger lines but remember we are still dealing with a significant instability. Solar effect will be strong on south and west aspects as the day progresses, limit your exposure.
Weather Forecast
We are in for another dry spell as a high pressure system will remain over the Province for the foreseeable future offering mostly clear skies and dry weather. Light winds, rising freezing levels and mild alpine temperatures are forecast until Friday when some cloud cover and Arctic air will make its way over the interior.
Snowpack Summary
1-1.5m of storm snow is settling into a cohesive slab over the Jan 28/22 facet/surface hoar/crust interface. Snowpack tests suggests this weak layer is difficult to trigger, but if failed has high propagation propensity. Below this the snowpack is well settled. Expect a sun crust on south and west aspects from yesterdays sunshine.
Avalanche Summary
6 natural slab avalanches up to size 2.0 occurred in the highway corridor yesterday. From Saturday a size 2.5 slab avalanche was observed around noon behind the Asulkan Hut. This could have been remotely triggered or triggered naturally.
Confidence
Due to the number of field observations
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.
Cornices
Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.
