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Archived

Avalanche Forecast

Mar 11th, 2018–Mar 12th, 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
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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

Regions: Northwest Inland.

Increasing freezing levels and sunny skies are heating the snowpack, with the most warming and highest danger around midday. The best riding will be in areas sheltered from the wind effect and sun, without any overhead exposure.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

MONDAY: Mostly sunny, light to moderate southerly winds, alpine temperature 0 C, freezing level rising to 2000 m.TUESDAY: Sunny, light to moderate southeasterly winds, alpine temperature 2 C, freezing level 2200 m.WEDNESDAY: Cloudy with light snowfall, accumulation 5 cm, light easterly winds, alpine temperature 0 C, freezing level 1600 m.

Avalanche Summary

Newly formed wind slabs were reactive to skiers and natural activity on Saturday, up to size 1 in direct lee features at treeline.  Loose snow was also noted in steep terrain features.

Snowpack Summary

Sustained southerly winds have produced wind slabs in lee features.  This overlies a sun crust on solar aspects and a surface hoar and sugary facet layer on sheltered, shady aspects.  Expect to find a melt-freeze crust or moist snow below around 1400 m.A surface hoar and crust layer from January is buried around 80 to 140 cm. This layer still has the potential to be triggered from a thin snowpack spot, or with a large trigger like a cornice fall.It is unlikely, but may be possible to trigger very large avalanches on facets at the bottom of the snowpack in steep, rocky, and shallow snowpack areas or with large triggers.

Avalanche Problems

Loose Wet

Rising freezing levels and sunny skies will allow for intense warming of the snowpack on solar aspects. Pay close attention to the effects of the sun on avalanche terrain and avoid overhead exposure.
Start early to stay off south facing slopes during the heat of the day.Watch for signs that the snow is heating up such as pin-wheeling and point-releases below cliffs.Avoid terrain traps such as gullies and cliffs where small avalanches can have high consequence.

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

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5

Wind Slabs

Strong southerly winds have redistributed the recent storm snow and formed touchy wind slabs. Use caution when entering into lee features.
Approach lee and cross-loaded slopes with caution.Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2