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Avalanche Forecast

Archived

Apr 29th, 2015–Apr 30th, 2015

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Glacier.

Weather Forecast

The forecast is generally unsettled. Today expect showers with freezing levels lowering to 2000m and moderate W'ly winds. We may see a few sunny breaks this afternoon. Thursday will be mostly cloudy with flurries/showers. Friday expect up to 10mm of precip with freezing levels to 2200m.

Snowpack Summary

There was no overnight recovery, with 6.3mm of rain at 1900m.The crust has been thinner between 1600-2000m and will break down faster there than at lower elevations.  Moist snow will almost certainly be found on most aspects and elevations. Any dry snow that could be found in high alpine north aspects will be come moist by later today.

Avalanche Summary

Loose, wet solar triggered avalanches were observed in the region yesterday. With the current rain on a weak isothermal snowpack avalanche activity is expected today.

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.

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.