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Archived

Avalanche Forecast

Dec 23rd, 2018–Dec 24th, 2018
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
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Glacier.

Asses the terrain and snowpack, test areas of little consequence before committing to your line as the buried persistent weak layers will produce large avalanches if triggered.

Weather Forecast

Mostly cloudy with isolated flurries with the small possibility of sunny periods. The alpine high could reach -8°c, winds should be 15kph from the SouthWest and the freezing level would reach 900m if all goes according to the forecast. Isolated flurries, cooling temps and light winds are in our future as we enter the Christmas Holidays.

Snowpack Summary

10cm of low density snow fell onto 50cm of settled storm snow which will result in excellent cold smoke skiing/riding. There could be pockets of lingering wind slab in lee features and cross loads in the alpine and open tree line areas. The Dec 9 and Nov 21 persistent weak layers are down ~100-120cm and still producing Hard and Sudden test results.

Avalanche Summary

No new avalanches observed or reported within the last 24 hours. A widespread natural avalanche cycle to size 2 - 3.5 occurred Friday morning with the strong/extreme SW winds. A large size 3.5 avalanche from Grizzly Peak / Dispatchers Bowl buried 80m of the Connaught Creek skin track, which traveled over 2km from the alpine to valley bottom.

Confidence

Avalanche Problems

Persistent Slabs

The Dec 9 weak layer is down 80-110cm and consists of surface hoar, facets, and sun crust, depending on the aspect. Sudden planar results are being seen on this layer. Natural and human triggered avalanches may still occur on this layer.
Watch for whumpfing, hollow sounds, and shooting cracks.Dig down to find and test weak layers before committing to a line.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3.5

Wind Slabs

50cm+ of storm snow, accompanied by strong SW winds and warm temp's, has formed a storm slab at all elevations; especially in immediate lee features below ridge crests and on cross-loaded slopes. Solar input may trigger slabs on steep, S'ly aspects.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.Be careful with wind loaded pockets, especially near ridge crests and roll-overs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2