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Archived

Avalanche Forecast

Feb 4th, 2017–Feb 5th, 2017
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
4: High
The avalanche danger rating in the alpine will be high
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

Regions: Kananaskis.

Times are changing.  New snow and winds are causing avalanche danger to increase.

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Sunday

Weather Forecast

An additional 20cm of snow is forecast to fall over the next 24hrs with winds beginning to increase into the moderate range.  Winds will continue to be cold.

Avalanche Summary

A few loose dry avalanches up to sz 1 were observed out of steeper terrain in the alpine. 

Snowpack Summary

20cm of recent storm snow (2150m) sits on top of a widespread hard wind slab from the Jan 29th wind event. The thickness of this slab varies between 10 & 30cm. A touchy facet layer sits below the hard wind slab. The midpack is consistently weak. The Nov 12 basal crust is still intact in some areas with depth hoar and facets below. The storm came in with very little wind. At the moment its thought there are isolated alpine storm slabs in immediate lee areas

Avalanche Problems

Storm Slabs

Recent new snow on Saturday and into Sunday combined with moderate westerly winds will build new storm slabs in alpine terrain.
Avoid freshly wind loaded features.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 2

Loose Dry

Loose dry slides may trigger storm slabs on underlying slopes.
Be cautious of sluffing in steep terrain.Sluffs may trigger deeper instabilities.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Very Likely

Expected Size: 1 - 1

Persistent Slabs

Triggering of these slabs from a thin weak area may cause an avalanche that involves the deeper layers and the entire snowpack. 
Minimize exposure during periods of heavy loading from new snow and wind.Be aware of thin areas that may propogate to deeper instabilites.Use caution on open slopes and convex rolls

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3