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Avalanche Forecast

Archived

Nov 12th, 2020–Nov 13th, 2020

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

Regions

Glacier.

Steep solar aspects in the alpine may harbour pockets of windslab on a sun crust. Watch for thin storm slabs at and above treeline.

Weather Forecast

Today: Cloudy with scattered flurries and sunny periods. Trace amounts of snow. Alpine high -10*C, fzl 700m. Winds Light-SW.

Tonight: Flurries, 5cm of snow. Alpine low -10*C, fzl 600m. Winds Light-S

Friday: Flurries, with 7cm of snow. Fzl 1100m. Winds light to mod SW.

Sat: Flurries, 4cm. Alp high -8*C, winds light/gusting mod SW

Snowpack Summary

A 7cm storm slab sits on top of the previous dust on crust surface. The thin, soft storm slab was easy to trigger at treeline on steeper terrain. Last week, rain fell as high as 2500m, with 50cm of snow accompanied by extreme W winds at upper elevations. The weekend saw strong N'ly winds, causing reverse loading of storm snow into S'ly lees.

Avalanche Summary

One size 1 skier controlled storm slab 7cm deep, 25m wide ran 300m on a steep NE aspect at 2100m in the west end of the park. A recent size 1 Sa occurred on a steep S aspect on Mt Rogers where the recently formed windslab failed on top of the Nov 5th crust.

Watch for frozen debris from the previous wet avalanche cycle.

Confidence

Due to the number and quality of field observations

Problems

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.

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.