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Archived

Avalanche Forecast

Feb 4th, 2020–Feb 5th, 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
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
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.

Reactive pockets of windslab exist in the alpine and exposed treeline.

Assess before committing to your run.

Weather Forecast

A benign weather day. Tomorrow, a Pacific low will work to push out the Arctic air.

Today: Mainly cloudy with isolated flurries. Treeline temp -13 °C. Light SW winds

Tonight: Trace of precipitation. Treeline temps steady at -13 °C. Light SW winds

Tuesday: 6cm snow. Freezing levels rising to 1200m, treeline temp  -6 °C. Light SW ridge winds gusting 70

Snowpack Summary

We received 20-30cm of low density snow in the wake of Saturdays storm. This sits on firm surfaces resulting from the Extreme winds, 70mm of precip, and 2000m freezing level mid storm. Expect rugged travel in all but smooth open slopes below treeline - with 10-15cm of snow on a crust. Pockets of windslab exist in lees at treeline and in the alpine.

Avalanche Summary

Loose dry point releases to size 1.5 were observed yesterday from steep, rocky, solar terrain features.

During Saturday's storm, numerous size 3-3.5 avalanches were triggered both naturally and by artillery from all aspects.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Wind Slabs

Fresh pockets of soft windslab that formed late in the storm linger on lee slopes. The deep and stiff widespread windslab that formed mid storm is generally unreactive, but may remain sensitive to large triggers like cornices in the alpine.

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Cornices

Cornices grew significantly Saturday and deserve a wide berth. Stay well back from corniced ridges.

  • Minimize exposure to corniced features.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5