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Avalanche Forecast

Archived

Apr 9th, 2014–Apr 10th, 2014

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

Regions

Glacier.

Weather Forecast

Cloudy with sunny periods and freeze lines rising up to 1700m. Light to locally moderate precipitation rates are forecast for this region, and may come as rain or snow. Cool unsettled weather is forecast for the next few days.

Snowpack Summary

An overnight freeze has left the surface snow crusty at tree-line and alpine elevations, although some dry snow may be found on due north aspects above 2400m extreme winds have blown this into possible slabs. The mid and lower snowpack are very well settled but no refreeze at Rogers Pass plot means low elevation is still loose and wet.

Avalanche Summary

Yesterdays natural avalanche cycle produced numerous avalanches from all aspects up to size 3.0. This was followed by some activity overnight from before the freezing temperatures up to size 3.0. Yesterdays shoot produced avalanches up to size 2.5 from about 1/2 the shots.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.