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Archived

Avalanche Forecast

Feb 15th, 2017–Feb 16th, 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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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.

Warm temperatures, moderate winds and precipitation in the form of snow/rain coming today.  Conservative route selection is prudent today.

Weather Forecast

Cloudy with flurries and potentially 5cm accumulation.  Wind SW in the moderate range is forecast and a freezing level of 1800m.  Another 16cm is expected tonight through Tuesday along with moderate S-SW winds. 

Snowpack Summary

Storm snow continues to settle assisted by mild temperatures. Solar aspect surfaces into the alpine will have become moist and possibly refrozen in the last 24hrs. S-SW moderate winds will have formed windslab in the immediate lee of ridge lines. Weak layers have been observed 25 and 60cm down. This includes Jan 25 suncrust on steep solar aspects.

Avalanche Summary

A dozen moist avalanches to size 2.5 were observed along the highway corridor mainly releasing on steep solar aspects. A size 2 solar released slide was observed on the SE aspect of Ross Peak yesterday morning before 10am.

Confidence

Freezing levels are uncertain

Avalanche Problems

Persistent Slabs

The January 25th sun crust, weak layer is buried down approx 60cm.  Before last week's storm it was giving easy sudden planar results and was reactive to human triggering.  Warming surface layers may reawaken this layer today.
Use extra caution on solar slopes or if the snow is moist or wet.Dig down to find and test weak layers before committing to a line.

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

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Wind Slabs

Moderate S-SW winds were moving snow along alpine ridges yesterday. Expect fresh windslab along the immediate lee of alpine wind exposed features.
Use caution in lee areas. Recent wind loading have created wind slabs.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2