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Archived

Avalanche Forecast

Feb 17th, 2021–Feb 18th, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Weather Forecast

Some isolated light flurries are possible over Rogers Pass from the passing upper trough this morning. Alpine temperature will hover in the -10 range, and winds will be light, possibly gusting moderate from the West. A clearing trend tonight, with light winds from the SW. Tomorrow a mixed bag of weather, with snow on the way this weekend.

Snowpack Summary

10-20cm of new snow covers a variety of old surfaces, from hard wind slabs in the alpine and exposed areas of TL, to low density facetted snow in sheltered areas at TL and below. The cold has weakened cornices and the upper snowpack. The January 24th interface is down 70-100cm and unreactive in stability tests.

Avalanche Summary

No new avalanches were observed int he HWY corridor yesterday. 2 size 1 slab avalanches were noted by field teams yesterday up Connaught Creek. 1 from Cheops North 1, and the 2nd on a west aspect above Ursus Trees.

Confidence

Avalanche Problems

Wind Slabs

The wind slabs are widespread; however, they are only reactive in isolated terrain features. Cold temperatures have facetted the snow under the wind slabs. There is an excellent MCR describing this problem in more detail that can be found here.

  • Watch for pockets of hard windslab in steep alpine features.
  • Watch for reverse loading created by N-NE winds.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5

Persistent Slabs

The Jan 24th interface has been easily found in numerous recent profiles; however, no results have been recorded as this layer becomes harder to trigger. There is still a lingering possibility that it could be triggered on steep solar aspects.

  • Persistent slabs may be more sensitive to human triggering on solar asp where it sits on sun crust
  • Dig down to find and test weak layers before committing to a line.

Aspects: South East, South, South West, West.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 3