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Avalanche Forecast

Apr 13th, 2018–Apr 14th, 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
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: Northwest Coastal.

Be aware of changing conditions with elevation. Variable winds may have formed wind slabs on a variety of aspects below ridgetops.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

SATURDAY: Cloudy with flurries. Strong southwesterly ridgetop winds. Alpine temperature -2. Freezing level around 1000 m.SUNDAY: Mix of sun and cloud. Light northeasterly ridgetop winds. Alpine temperature 1. Freezing level rising to around 1200 m.MONDAY: Mostly sunny. Light northeasterly ridgetop winds. Alpine temperature -2. Freezing level around 1000 m.

Avalanche Summary

No new avalanches were reported in this region on Thursday. On Wednesday, a size 2.5 persistent slab avalanche was remotely triggered by a group of skiers on a ridgetop from 10 m away. The avalanche failed on surface hoar about 70 cm deep on a north aspect at 1800 m. A size 2 wet slab was triggered by day-time warming in the same area near Bear Pass.

Snowpack Summary

5-15 cm of recent storm snow and strong variable winds have formed wind slabs on a variety of aspects at treeline and above.In the south of the region, two layers of surface hoar are buried approximately 70-100 cm deep. The layers are most prominent on north to east aspects and were buried early-March and mid-March. In the north of the region, these layers are around 40 cm deep.Bellow these March layers the mid-pack is generally well-settled and strong. However, shallower parts of the region, such as the far north, have weak sugary facets near the bottom of the snowpack.

Avalanche Problems

Wind Slabs

New snow may bond poorly to an underlying crust. Watch for fresh wind slabs in leeward areas near ridge crests and convex features.
Use caution when transitioning into wind effected terrain.Use small slopes with low or no consequence to test the bond of the new snow.Avoid areas that look freshly loaded with snow; especially convex features below ridgetops.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Loose Wet

When the sun comes out it will quickly weaken the new snow and cause loose wet avalanching on steep solar slopes.
Watch for signs that the snow is heating up such as pin-wheeling or the surface snow becoming moist.Avoid steep terrain that is in the sunshine.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2