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Archived

Avalanche Forecast

Nov 19th, 2017–Nov 20th, 2017
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Another stormy day today with heavy snowfall and wind loading.Expect natural avalanches today that could run to valley bottom.

Weather Forecast

Another stormy day! Today 20 cms are forecast, with 35km/hr winds from the Southwest.  Tonight we can expect another 10-15cm before a break between storms on Monday. Further out the current forecast shows another weather system Tuesday/Wednesday bringing precipitation and high freezing levels.

Snowpack Summary

We received another 14cm of snow in the last 24hrs, bringing the storm total to approx 80cm. The snow pack has almost doubled in the last week and a half! The Halloween crust is the layer we're watching and it's down approx 90cm.The Nov 9th is a hard to find & spotty surface hoar layer in the top 70cm.The snowpack remains shallow below 1700m

Avalanche Summary

Numerous avalanches to size 2 were observed in the highway corridor from very steep terrain on Mt MacDonald and Tupper in the last 48 hrs. There was also avalanche debris reported from steep north facing terrain in Cannaught creek drainage. This increase in avalanche activity can be attributed to recent snow loading and strong winds in the alpine.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Storm Slabs

Heavy snow loading and strong alpine winds have created a reactive storm slab in the alpine. The storm slab will be more reactive in unsupported terrain and ridgetop terrain features exposed to wind loading.
The new snow will require several days to settle and stabilize.Minimize overhead exposure during periods of heavy loading from new snow, wind.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

The Halloween Crust layer is buried down approximately 90cms. With the recent loading from heavy snow and strong winds we could see this layer become reactive. If it does "wake up" the resulting avalanches would be large!
Minimize exposure during periods of heavy loading from new snow and wind.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2 - 3