Avalanche forecast

Sea To Sky

Jan 21, 2018Avalanche Canada
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Archived · expired 9 years ago

Avalanche danger

Mon
Tue
Alpine
4 · High
Treeline
4 · High
Below
4 · High
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Highlights

With a strong winter storm system set to bring heavy snowfall and high winds, Sunday looks like a good day to enjoy the resort.  Or stick to simple terrain free of overhead hazard if you choose to venture into the backcountry.

Avalanche problems

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Very Likely
    Size
    1.5–3
    Storm snow and strong winds have formed reactive storm slabs. These slabs overlie recently buried wind slab and a recent melt-freeze crust, and will continue to build with more snow and wind in the forecast.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

TONIGHT: Snow. Accumulation 30-40 cm. Ridge wind strong to extreme, south. Temperature -5. Freezing level 1000 m.SUNDAY: Snow. Accumulation 25-35 cm. Ridge wind strong to extreme, south. Temperature -4. Freezing level 1000 m.MONDAY: Flurries. Accumulation 5-10 cm. Ridge wind light to moderate, southwest. Temperature -4. Freezing level 900 m.TUESDAY: Snow. Accumulation 15-20 cm. Ridge wind strong, south. Temperature -4. Freezing level 900 m.

Avalanche Summary

Both natural and human triggered avalanches are likely with intense loading from forecasted snowfall and wind amounts.Explosive control work on Friday produced only a few size 1 and isolated size 2 avalanches failing in the recent storm snow or running on the recently buried January 15th crust. On Thursday there were reports of natural avalanches up to size 2.5, while ski cuts and explosive control work produced numerous size 1-1.5, and up to size 2, storm slab avalanches 20-50 cm deep on predominantly northerly aspect, running far and wide within the recent storm snow.Earlier in the week ski cutting and explosive control work produced numerous easily triggered size 1-1.5 storm slab results running on the January 15th crust.

Snowpack Summary

Above 1400 m elevation, 40-70 cm of storm snow overlies the crust that was buried mid-January and is present at all elevations. This crust is thin on northerly aspects and up to 3 cm thick on solar aspects. Below this crust 30-40 cm well settled snow overlies a second crust that was buried early-January and now lies about 100 cm below the surface at elevations up to 2000m. Beneath the early-January crust, the lower snowpack is generally strong and well settled. Recent snowpack tests have produced easy to moderate, resistant results within the recent storm snow as well as hard, resistant results above the recently buried mid-January crust.

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