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Archived

Avalanche Forecast

Dec 10th, 2012–Dec 11th, 2012
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
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: Glacier.

Conditions have changed from the past few days with moderate winds and new snow, choose your terrain accordingly.

Weather Forecast

2 systems cross the region over the next 2 days . An upper trough today brings milder temps and drops in wind at lower elevations. Mountain top winds to remain NW 60 to 80km/h. The second system arrives Wednesday bringing light precipitation.

Snowpack Summary

Lower density snow in the upper 30 to 45cm. This overlies a well settled mid pack. The Nov 6 Cr is down approx. 150cm. Mixed forms sz 1.0 were observed above the crust. Profile below Asulkan Hut, 1990m, W asp, 43deg, HS 185cm CTM (PC) down 25cm on df 2.0, DTH (B) down 150cm on mx 1.5 (nov 6 cr)

Avalanche Summary

5 Natural size 2.0 loose avalanches were observed yesterday morning in the north acing gullies of Mt Macdonald.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Avalanche Problems

Wind Slabs

Overnight winds picked up to ideal transport values to form wind slab.  Wind direction has varied from S-SW at treeline to W-NW it mountain top. Lee slopes lower down may not be the same up high.
Be cautious as you transition into wind affected terrain.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Loose Dry

With an additional 10-15cm of very light snow, sluffing is a concern where the wind has had no effect. Caution skiing in steep terrain and over terrain traps where sluffs will gain mass into avalanches.
Be aware of party members below you that may be exposed to your sluffs.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2