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Archived

Avalanche Forecast

Jan 9th, 2012–Jan 10th, 2012
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
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Northwest Inland.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Thursday

Weather Forecast

A few more cm of new snow is expected on Monday night for Coastal and Interior regions. Temperatures are expected to drop to about -15 in the alpine by Tuesday morning as a ridge of high pressure moves into the region. Wednesday is expected to be mostly clear, but not as cold as Tuesday. The next system should be on the coast by Wednesday night or Thursday morning.

Avalanche Summary

Reports of natural avalanches up to size 2.5 from northerly aspects. I suspect windslab releases from snow transported by the recent storm.

Snowpack Summary

Heavy rain up to about 1000 metres on Saturday night ended around 0800 Sunday. Cooling since the storm has created a rain crust up to about 1200 metres. There is about 235 cm at 1500 metres. There is an old rain crust that is buried down about a metre that is knife hard and showing old facets above and below. The snowpack is well settled below the rain crust down to the ground. The snowpack in the alpine is highly variable. Strong winds with almost every storm this winter have scoured ridges and knolls down to bare ground, and exposed boulders on some slopes.

Avalanche Problems

Wind Slabs

Windslabs are settling and becoming more stubborn to human triggers.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 5

Persistent Slabs

Persistent slabs are getting harder to trigger but still exist in many locations.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 6