Archived

Avalanche Forecast

Nov 30th, 2016–Dec 1st, 2016

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

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

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: South Columbia.

Be on the lookout for lingering wind slabs in the alpine. Avoid likely trigger spots such as shallow, rocky, wind affected areas.

Confidence

Low - Due to the number of field observations

Weather Forecast

THURSDAY: Mix of sun and cloud / Light westerly winds / Freezing level at valley bottom. FRIDAY: Stormy with 5-10 cm snow / Moderate to strong southwesterly winds / Freezing level around 1100 m. SATURDAY: Stormy with 5-10 cm snow / Moderate to strong westerly winds / Freezing level around 900 m.

Avalanche Summary

Explosive control work near revelstoke produced numerous loose snow avalanches up to size 1.5 on Tuesday. Observations in this region remain limited.

Snowpack Summary

Lingering wind slabs may exist in open terrain at treeline and above. There have been reports of small surface hoar forming with spotty distribution. The incoming snow this weekend will be especially reactive where this layer exists. The mid-November crust is now buried 60-120 cm deep. Although reports suggest the overlying snow is well bonded to this crust, this layer may become active as the snow load increases. Below the crust the snowpack is generally well settled. Snowpack depths vary greatly throughout the region with an average of 100-180 cm at treeline elevations with less snow in the southern portion of the region. Early season hazards such as stumps, rocks, and open creeks remain the primary hazards below treeline.

Avalanche Problems

Wind Slabs

Lingering wind slabs may still be reactive to human triggers.

Be cautious as you transition into wind affected terrain.Avoid slopes that sound hollow or drum-like.Use ridges or ribs to avoid pockets of wind loaded snow.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2