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Archived

Avalanche Forecast

Feb 27th, 2014–Feb 28th, 2014
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
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.

Patience, and in time, you will be rewarded. Give the surface slab a little more time to bond to the underlying weakness.

Weather Forecast

A cloudy day is forecasted for the region today, with light to moderate west winds in the alpine and nil precipitation. Freezing levels may reach 1500m today, but there won't be the same kind of punch to the sun as yesterday. Friday, and into the weekend, will see clearing and cooler temperatures in the area, with low's reaching into the -20's.

Snowpack Summary

1-1.4m of storm snow has settled into a cohesive slab over the Jan 28/22 facet/surface hoar/crust interface. Tests suggest this weak layer is difficult to trigger and gaining strength, but if failed has high propagation propensity. Below this the snowpack is well settled. A surface sun crust has been found on steeper south and west aspects.

Avalanche Summary

Numerous avalanches from size 1.5-2.5 were observed from steep, southerly aspects yesterday along the highway corridor.

Confidence

Avalanche Problems

Persistent Slabs

The 1-1.5m slab overlying the Feb 10th weak layer is slowly bonding to this interface, but is still reactive in tests. This problem requires good terrain management, such as avoiding large convexities and sticking to supported features.
Be aware of the potential for large, deep avalanches due to the presence of buried surface hoar.Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 4

Cornices

Cornices are a definite concern, given their size and mass. If they were to fail, they could be the big trigger to initiate an avalanche in the deeper layers.
Pay attention to overhead hazards like cornices.Cornices become weak with daytime heating, so travel early on exposed slopes.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 4