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Archived

Avalanche Forecast

Apr 19th, 2018–Apr 20th, 2018
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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.

Consider the hazard to be HIGH in localized areas that receive more than 25 cm of new snow.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

THURSDAY NIGHT: Snow; accumulation 10-25 cm. Strong southwest wind. Freezing level 800 m. FRIDAY: Snow; accumulation 5-15 cm. Strong southwest wind. Alpine temperature -1. Freezing level 1000 m.SATURDAY: Cloudy with flurries; accumulation 3-5 cm. Moderate southwest wind. Alpine temperature -2. Freezing level 800 m. SUNDAY: Cloudy with isolated flurries. Light southwest wind. Alpine temperature 0. Freezing level 1200 m.

Avalanche Summary

No new avalanches were reported in this region on Wednesday. However, I would expect the incoming storm on Thursday night to form fresh storm slabs reactive to human triggers; especially in wind affected terrain at treeline and above.

Snowpack Summary

The incoming snow and strong winds on Thursday night will create touchy storm slabs at treeline and above.In the south of the region, two layers of surface hoar are buried early-March and mid-March are approximately 70-100 cm deep and most prominent on north to east aspects. Further north, these layers are around 40 cm deep.Below these March layers the mid-pack is generally well-settled and strong. However in the far north of the region there are weak sugary facets near the bottom of the snowpack.

Avalanche Problems

Storm Slabs

Forecast new snow and strong winds are expected to create touchy storm slabs reactive to human triggers; especially in wind affected terrain.
Use caution when transitioning into wind affected terrain.Watch for signs of instability such as whumphing, cracking, or recent natural avalanches.Use small slopes with low or no consequence to test the bond of the new snow.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 2

Loose Wet

New snow below treeline may quickly become moist and increase the likelihood of loose wet avalanches.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.Watch for signs that the snow is heating up such as pin-wheeling or the surface snow becoming moist.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Likely

Expected Size: 1 - 2