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Archived

Avalanche Forecast

Nov 12th, 2020–Nov 13th, 2020
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

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

Avalanche Problems

Storm Slabs

Watch for thin soft storm slabs at and above treeline. These slabs may be of consequence in steep confined terrain features such as gulleys where they could gain greater volume.

  • The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wind Slabs

Reverse loading from outlfow winds has built small pockets of windslab in immediate lees. These sit on a firm crust below 2500m and higher on steep solar aspects.

  • Use safe ski cutting techniques to enter your line.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2