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Archived

Avalanche Forecast

Feb 18th, 2021–Feb 19th, 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
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
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.

Hard wind slabs overlying facets, are behaving more like persistent slabs, and becoming harder to trigger.

The best riding conditions exist in sheltered areas at and below tree line.

Weather Forecast

Today is starting off cold and clear. High cloud will start to push through this afternoon, as a storm system off the coast tries to move over Rogers Pass. Alpine temperatures will hover around -10, and  winds will be light from the SW. Flurries tonight, with increasing winds. 6cm of new snow on Friday, 7cm on Friday, and 33cm on Sunday.

Snowpack Summary

Approx 15cm 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. Cold temps continue to facet the upper snowpack, and weaken cornices. The January 24th interface is down 70-100cm and predominantly unreactive in stability tests.

Avalanche Summary

No new avalanches were observed int he HWY corridor yesterday. A MIN report of a size 1 slab avalanche in Camp West Lite size 1-1.5. Another MIN report of sluffing to size 1 up the Asulkan drainage. Overall very minimal avalanche activity has been observed recently.

Confidence

Avalanche Problems

Wind Slabs

~ Approx 15 cm of new snow is hiding hard wind slabs in the alpine and exposed areas of tree line. Cold temps continue to facet and weaken the upper snow pack. 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.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

The Jan 24th interface has been easily found in numerous recent profiles; however, minimal results have been recorded as this layer becomes harder to trigger. This layer is most concerning on steep, unsupported terrain features, on solar aspects.

  • Persistent slabs may be more sensitive to human triggering on solar asp where it sits on sun crust

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 3