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Archived

Avalanche Forecast

Feb 18th, 2018–Feb 19th, 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
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
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.

Cold temperatures! Moderate to strong N-E winds are forming reverse loaded windslab. Be cautious and take the time to evaluate the snowpack.

Weather Forecast

Today a mix of sun and cloud, NE-E winds to 25km/h and an alpine high temperature of -20C, that will feel bitterly cold. A mix of sun and cloud and continued cold with daytime highs of -20C accompanied by light N-E winds to start the new work week.

Snowpack Summary

Over 15 hours of strong N-NE winds are reverse loading storm snow along ridgelines and exposed terrain at and above treeline. Expect widespread wind effect. On solar aspects, a well developed crust is buried 40cm. Persistent weak layers from January and December are now buried 150-200cm.

Avalanche Summary

A couple size 2 slides recorded in the highway corridor yesterday. Also one slide heard but not observed off the north aspect of Cheops in the Connaught Creek drainage.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

15 hrs of strong N-NE winds have formed reverse loaded windslab at and above treeline. Natural and skier triggered avalanches are expected from this ongoing loading. Avoid exposing yourself to overhead hazard.
Watch for whumpfing, hollow sounds, and shooting cracks.Use caution in lee areas. Recent wind loading has created wind slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Persistent Slabs

These slabs will be most susceptible to triggering in shallow areas. This type of instability will linger for a while yet. The significant storms seen recently have overloaded these layers, priming slopes to fail only awaiting a trigger.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1.5 - 4