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Avalanche Forecast

Archived

Apr 25th, 2014–Apr 26th, 2014

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 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.

Regions

Glacier.

An unsettled forecast could bring intense periods of sun and periods of rain, both of which will increase danger.

Weather Forecast

Today should be cloudy with sunny periods and some convective flurries. Freezing levels will rise to 1800m, and light winds won't do much to help keep things cool. A system moving in on Saturday will bring up to 10cm of snow above 1700m with light to moderate SW winds. Sunday will be similar with lighter precipitation amounts.

Snowpack Summary

Below treeline, warm temperatures overnight prevented a freeze. Above 1900m ~20cm of moist snow sits on a crust. Mod SW winds loaded immediate lees. Several crusts in the top meter of the snowpack provide potential failure layers and sliding surfaces for avalanches.

Avalanche Summary

Cooler temps and high cloud kept things quiet yesterday avalanche wise. Wind loaded pockets in the immediate lees were reactive to ski cuts on steep slopes yesterday. These size 1 avalanches were loose, as the new snow had no slab properties. As it settles it may develop more propagation potential as it fails on a crust.

Confidence

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

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.

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.