Avalanche Forecast

Issued: Apr 17th, 2018 3:56PM

The alpine rating is considerable, the treeline rating is considerable, and the below treeline rating is moderate. Known problems include Loose Wet and Storm Slabs.

mconlan, Avalanche Canada

South Coast.

A warming and sunny trend is forecasted. This will weaken the recent snow and increase the likelihood of triggering avalanches. Be cautious on south slopes and avoid overhead exposure when it is sunny or warm.

Summary

Confidence

Moderate - Timing or intensity of solar radiation is uncertain

Weather Forecast

WEDNESDAY: Mostly cloudy with afternoon clearing, light southeast winds, treeline temperature 0 C, freezing level 1000 m rising to 1500 m.THURSDAY: Sunny with some afternoon cloud, light southwest winds, treeline temperature 0 C, freezing level 1400 m.FRIDAY: Cloudy with afternoon precipitation, light to moderate southwest winds, treeline temperature -1 C, freezing level 1300 m.

Avalanche Summary

We have received very little information on avalanche activity for this region. From what we have heard, skiers could easily trigger small loose wet avalanches on Monday. Natural loose wet avalanches were also observed in treeline and alpine terrain, particularly on southerly aspects. Large slab avalanches were also observed, which may have released during the storm on Friday.We would very much appreciate it if you spend a moment to submit any observations you have to the Mountain Information Network here, even if it is just a photo. Thanks!

Snowpack Summary

Above about 1200 m, 30 to 40 cm of snow on Monday and Tuesday fell on a melt-freeze crust formed by Sunday's sunshine and warm air temperatures. The snow below this is well-settled and strong.Below 1200 m, a spring snowpack exists.

Problems

Loose Wet

The sun and warming temperatures will rapidly weaken the snow surface. Expect loose wet avalanches, particularly on steep southerly terrain and near rocks. Watch your overhead exposure, as they can grow and become large and destructive.

Avoid steep slopes when the solar radiation is strong.Use extra caution on slopes if the snow is moist or wet.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Likely

Expected Size

1 - 2.5

Storm Slabs

Recent snowfall has formed storm slabs, which overlies a melt-freeze crust in most areas. The snow could slide on the crust and produce large avalanches. Be cautious on or below corniced ridges, as cornice falls could trigger slab avalanches.

Pay attention to overhead hazards like cornices, which could trigger slabs on slopes below.Observe for the bond of new snow with the old surface before committing into avalanche terrain.Be cautious as you transition into wind-affected terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2.5

Valid until: Apr 18th, 2018 2:00PM