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Archived

Avalanche Forecast

Feb 4th, 2018–Feb 5th, 2018
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Little Yoho.

The hazard has been reduced to considerable, however human interaction with avalanches is still very likely on steep terrain and terrain uniform features.Our Wx stations are currently down, we are working on getting them back online ASAP.

Weather Forecast

A slight cooling and clearing trend is expected for Monday. The wind is also expected to die down and shift to the west. However, the moment of respite will be short lived. Another storm is expected to arrive midday on Wednesday bringing warm temps, precip and an increase in wind. We expect the danger to rise significantly at that time.

Snowpack Summary

Up to 40cm of storm snow (48hrs) and strong wind have created slabs that are primed for human triggering. The main concern in the snowpack continues to be the 3 persistent weak layers of surface hoar and/or facets that are found between 50 and 100cm down. We continue to observe sudden test results, whumphing and large propagations on these layers.

Avalanche Summary

Natural activity was directly observed across Bow Lake today. A cornice released off of a cliff and triggered the slope below it, size 2. An avalanche control operation produced 3 size 3 avalanches on West facing avalanche paths on 93N. The debris ran to mid run out. Additionally, evidence of a widespread cycle up to size 3 was observed.

Confidence

Due to the quality of field observations on Sunday

Avalanche Problems

Persistent Slabs

Three weak layers exist in the upper snowpack: Jan 16, Jan 6, and Dec 15. All are a mix of sun crust, surface hoar and facets depending on the aspect and elevation. Natural activity is tapering, but it is still primed for human triggering.
Avoid all avalanche terrain.Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3.5

Storm Slabs

20-40cm of recent storm snow (and wind) has developed a reactive slab at higher elevations, numerus skier triggered avalanches have been reported on this layer. Continue to make conservative route choices.
Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5