Avalanche forecast

Sea To Sky

Jan 17, 2018Avalanche Canada
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Archived · expired 9 years ago

Avalanche danger

Thu
Fri
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Highlights

New snow and wind have created touchy storm slabs above the crust that formed with recent warm temperatures.  These slabs will continue to build and hazard rise as the next storm system arrives on Wednesday.

Avalanche problems

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2
    Loading from new snow and strong winds will create widespread storm slabs. A release near the surface may still have the potential to step down to a deeper layer.

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

TUESDAY NIGHT: Flurries. Accumulation 2-5 cm. Ridge wind moderate, south. Temperature -2. Freezing level 1000 m.WEDNESDAY: Cloudy, snow. Accumulation 30-40 cm. Ridge wind strong to extreme, south. Temperature near 0. Freezing level rising to 1600 m.THURSDAY: Cloudy, snow. Accumulation 15-25 cm. Ridge wind strong, southwest. Temperature near 0. Freezing level 1000 m.FRIDAY: Cloudy, snow. Accumulation 5-15 cm. Ridge wind moderate, south. Temperature -3. Freezing level 900 m.

Avalanche Summary

Tuesday, explosive control work and ski cutting produced numerous size 1-1.5 storm slab releases on leeward aspects at treeline and into the alpine, running on the January 15th crust.  Expect this activity to increase as more snow and strong winds forecasted for Wednesday and Thursday.Warm alpine temperatures on Sunday produced numerous naturally triggered loose wet and wet slab avalanches mostly in the size 1-1.5 range, and a few up to size 2 on solar aspects.

Snowpack Summary

Above 1600 m elevation, 20-40 cm of new snow overlies the January 15th crust which exists on all aspects and elevations. This crust is thin on northerly aspects and up to 3 cm thick on solar aspects. Below this crust 30-40 cm of moist, well settled snow overlies the January 6th crust which is now buried 40-80 cm below the surface and exists up to about 2000m. Beneath the January 6 crust, the lower snowpack is generally strong and well settled.

Regions covered