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Avalanche Forecast

Archived

Apr 25th, 2017–Apr 26th, 2017

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

Regions

Little Yoho.

Even short solar inputs will increase the reactivity of the new snow.  Watch for changing conditions through the day.

Weather Forecast

Clearing overnight with increased cloud cover Wednesday morning, more precipitation is forecasted with amount ranging from 5-10cm. Winds are expected to remain light in the alpine. Temperatures will hover around zero degrees for the valley with alpine temperature in the -5 to -10 range.

Snowpack Summary

20-40cm of new snow overnight with minimal winds Tuesday kept the storm snow light in the alpine, steep solar aspects and lower elevations did see settlement and moistening in the storm snow. The new snow sit over numerus melt freeze crust's on all aspects below 2300m and high alpine on solar. The weak basal facets remain a concern in alpine areas.

Avalanche Summary

Numerus loose dry avalanches to size 1.5 have released in the storm snow, although no real slab has developed in the new snow, the storm interface is touchy and easy to trigger loose avalanches.

Confidence

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.