Natural avalanches possible, human triggered probable.
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 and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Regions
Glacier.
Weather Forecast
Flurries are forecast today and tonight with around 10 cm. Alpine temperatures will warm to -8 with light southwest ridge top winds. Snow will continue Monday and Tuesday with forecast amounts 15 and 18 cm respectively. Freezing levels will rise to around 1000 m for Mon/Tues.
Snowpack Summary
Light snow today will bury a varied of surfaces, including sun crust, surface facets, small surface hoar and wind deposits. The Jan 28/Feb 10 PWLdown 1-1.4m under a cohesive slab, is becoming more difficult to trigger but has high propagation propensity.
Avalanche Summary
No new avalanches were observed yesterday along the highway corridor. Strong solar radiation this past week had produced numerous avalanches up to size 2.5.
Confidence
Intensity of incoming weather systems is 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.
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.