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Archived

Avalanche Forecast

Mar 16th, 2017–Mar 17th, 2017
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high
Alpine
5: Extreme
The avalanche danger rating in the alpine will be extreme
Treeline
5: Extreme
The avalanche danger rating at treeline will be extreme
Below Treeline
4: High
The avalanche danger rating below treeline will be high
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high

Regions: Little Yoho.

Avoid all avalanche terrain and the runouts of any avalanche path.

Weather Forecast

Freezing level to valley bottom Thursday night and a break from the storm. Winds will be in the moderate range. Another significant storm arrived Saturday morning with 30mm expected, alpine winds to 100kmh and freezing levels to 1900-2000m .

Snowpack Summary

30-60cm Thursday and moderate to strong winds have continued to build significant load over midpack facets. The mix of previous rain, warm temperatures, and this new snow is overloading buried storm and windslabs, as well as the deeper facet layers which have woken up. 

Avalanche Summary

A historic avalanche cycle is underway, with avalanches up to size 3.5 being widespread. Some are reaching maximal runouts, including onto trails in simple terrain. Avoid all avalanche terrain .

Confidence

Avalanche Problems

Persistent Slabs

Several buried weak layers in the middle of the snowpack are being reactive again during this avalanche cycle. Avoid avalanche terrain now.

  • Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely - Certain

Expected Size: 2 - 4

Wind Slabs

Wind slabs up to 1meter deep exists at higher elevations, and in specific wind effected areas near treeline. Expect these to continue growing with additional inputs.

  • Use caution in lee areas. Recent wind loading have created wind slabs.

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

Elevations: Alpine, Treeline.

Likelihood: Very Likely

Expected Size: 2 - 3

Loose Dry

With all the new snow kicking around gullies and steep terrain will be sluffing over the short term.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Very Likely - Certain

Expected Size: 1 - 2