Avalanche forecast

Northwest Coastal

Mar 15 – 16, 2018Avalanche Canada
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Avalanche danger

Sat
Sun
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

Expect to find lingering wind slabs at high elevations and wet snow at low elevations.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2.5
    Isolated wind slabs may linger in lee features. These slabs overly a weak surface hoar layer in parts of the region, which have produced wide propagations and fast-moving avalanches.

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1–2
    Mid-mountain freezing levels will mean that loose wet avalanches are more likely at lower elevations. Use caution in terrain features where a small avalanche could have serious consequences.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

FRIDAY:  Mix of sun and cloud, light northeasterly winds, alpine temperature 1 C, freezing level 1500 m.SATURDAY: Mostly sunny, light northeasterly winds, alpine temperature 2 C, freezing level 1600 m.SUNDAY: Partly cloudy, light northerly winds, alpine temperature 1 C, freezing level 1500 m.

Avalanche Summary

On Wednesday, loose wet avalanches were observed at treeline and below treeline elevations.  Some of these stepped down to basal facets in parts of the region.

Snowpack Summary

Recent warming and rain have melted and refrozen the snow surface at higher elevations.  Expect the snow surface to be wet or a melt-freeze crust on all aspects except for possibly high elevation north.  Strong easterly to southerly winds have redistributed any available soft snow and produced variable surfaces at high elevations, including wind slabs in lee and cross-loaded features.  This overlies a sun crust on solar aspects and 5 to 20 mm surface hoar on sheltered, shady aspects at all elevation bands.Beneath this, layers of crusts, facets, and isolated surface hoar buried 50 to 100 cm exist below the surface from mid- and late-February.  A surface hoar and crust layer from January is buried around 150 to 200 cm.Near the bottom of the snowpack, sugary facets exist in colder and dryer parts of the region, such as the far north.

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