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Avalanche Forecast

Archived

Nov 11th, 2020–Nov 12th, 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

Cloudy with sunny periods and isolated flurries. -12C for an alpine high along with light westerly winds and a freezing level of 600m. Similar weather for Thursday with a trace of precipitation. Friday brings scattered flurries and freezing level rising to 1100m.

Snowpack Summary

7cm of 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 recently formed windslab triggered 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.