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Archived

Avalanche Forecast

Feb 13th, 2020–Feb 14th, 2020
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
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

Regions: Glacier.

Stubborn storm slabs need to be kept in mind touring today.  Expect sun crust on steeper solar aspects.

Weather Forecast

Flurries with up to 6cm accumulation today an alpine temp of -7C and wind SW light gusting to strong. The freezing level should edge up to 900m. Another 10cm are on the way tonight with a trace of precipitation forecast for Friday.

Snowpack Summary

Mild temps with light snowfall have created a soft, cohesive 10-20cm storm slab that overlies variable old surfaces. Recent mod/strong SW winds redistributed low density snow at ridge-top and exposed tree-line elevations; variable soft slab should be expected in these areas. Solar input yesterday will have formed sun crust on steep S aspects.

Avalanche Summary

Several sz 1-2 avalanches were observed in the highway corridor both east and west of Rogers Pass summit. These slides were all believed to run on February 11th, 2020. On Tuesday field team in the Hermit basin, as well as Fidelity, were able to ski cut the upper 10-15cm soft slabs on unsupported rolls at tree-line.

Confidence

Avalanche Problems

Storm Slabs

Snowfall earlier this week was accompanied by milder temps, creating a 10-20cm soft slab that seemed reactive on steep, unsupported rolls at all elevations. This new storm slab may hide previous wind slabs in alpine lee and cross-loaded features.

  • Steep unsupported terrain and slope convexities are the likely locations to awaken the storm slab.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2