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Archived

Avalanche Forecast

Mar 9th, 2019–Mar 10th, 2019
Alpine
1: Low
The avalanche danger rating in the alpine will be low
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
1: Low
The avalanche danger rating in the alpine will be low
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 Coast.

Conservative terrain selection is recommended in the North Shore Mountains where there is a lingering possibility of triggering large persistent slab avalanches.

Confidence

High -

Weather Forecast

SATURDAY NIGHT: Clear, light northeast wind, alpine temperatures drop to -5 C.SUNDAY: Sunny, light west wind, treeline temperatures near -2 C, freezing level 900 m.MONDAY: Snow starting in the afternoon with 10 cm by the evening, 20-40 km/h west wind, treeline temperatures near -2 C, freezing level 600 m.TUESDAY: Snow continues in the morning and eases off in the afternoon, total accumulation of 20-30 cm over the course of the storm, 20-50 km/h northwest wind, treeline temperatures near -2 C, freezing level 900 m.

Avalanche Summary

On Friday, small loose dry avalanches were triggered by skiers within the recent storm snow (see an example in this MIN report here). Since then the storm snow has likely settled and bonded to the underlying snow.

Snowpack Summary

Mild temperatures have settled 10 to 30 cm of snow that fell a few days ago. This snow overlies a variety of layers, including wind-affected snow at higher elevations, soft and faceted snow in shaded and sheltered areas, and a melt-freeze crust on steep southerly slopes.A layer of weak and sugary faceted grains sits on a melt-freeze crust about 50 to 120 cm deep. The layer is likely most prominent in the North Shore Mountains and on north aspects. This layer continues to be reactive in snowpack tests. The problem is not typical for the region and we expect this persistent weak layer to continue to linger.The lower snowpack is generally strong.

Avalanche Problems

Persistent Slabs

A layer of weak and sugary faceted grains sits on a melt-freeze crust about 50 to 100 cm deep. This problem seems to be most prevalent in the North Shore Mountains.
Use conservative route selection, choose moderate angled and supported terrain with low consequence.Use caution above cliffs and terrain traps where avalanches may have severe consequences.Use added caution on southerly slopes during periods of strong sun.

Aspects: All aspects.

Elevations: Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3