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Avalanche Forecast

Feb 18th, 2017–Feb 19th, 2017
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
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
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
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: South Columbia.

The best riding right now is probably on high north aspects, which is also where the hazard is the highest. Don't let your guard down when searching for fresh powder.

Confidence

Moderate - The weather pattern is stable

Weather Forecast

We're into a fairly stable weather pattern: seasonal temperatures and isolated flurries. SUNDAY: Cloudy with light flurries (2-5cm possible), light southerly winds and freezing levels around 1400 m.MONDAY: Cloudy with light flurries, local accumulations 5-10cm, light to moderate southwesterly winds and freezing levels around 1300 m.TUESDAY: A mix of sun and cloud with flurries starting in the afternoon, light winds and freezing levels around 1200 m.

Avalanche Summary

Reports from Thursday and Friday morning include natural, ski-cut and explosives controlled 15-40 cm thick storm and wind slab avalanches up to Size 2.5 (typically in the alpine, on northerly or east aspects). Other reports from late last week include continued natural wet avalanche activity up to Size 2.5 at lower elevations below the rain line. Touchy new storm slabs are sensitive to light triggers and have the potential to step down and trigger persistent slab avalanches.

Snowpack Summary

Expect to find 25-40 cm of fresh snow bonding poorly to buried surface hoar and/or a crust, and blown into touchy wind slabs at higher elevations. Below 1500m a frozen rain crust is mostly supportive, but up to 1800m it can be breakable. Rapidly settling storm snow from last week is still bonding poorly to the previous snow surface from early February, which is now down 60-80 cm and includes a sun crust on steep sun-exposed slopes, faceted snow, as well as surface hoar on sheltered open slopes. The mid and lower snowpack are generally well settled and stable in deeper snowpack areas but may be faceted and weaker in shallower areas.

Avalanche Problems

Storm Slabs

Fresh storm slabs are sensitive to light triggers and particularly deep and touchy on wind-loaded slopes.
Use caution in lee areas in the alpine and treeline. Storm snow is forming touchy slabs.Be alert to conditions that change with elevation.Avoid freshly wind loaded features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Persistent Slabs

A persistent weakness down 50-80 cm remains remains sensitive to light triggers in isolated areas. Smaller avalanches have the potential to step down to this layer.
Use conservative route selection, choose moderate angled and supported terrain with low consequence.Whumpfing, shooting cracks and recent avalanches are all strong indicators of unstable snowpack.Be aware of the potential for large avalanches due to the presence of buried weak layers.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3