Avalanche Forecast

Issued: Mar 26th, 2015 9:41AM

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

Avalanche Canada ccampbell, Avalanche Canada

Avalanche hazard will likely be on the rise as forecast storm snow begins to stack up.

Summary

Confidence

Fair - Intensity of incoming weather systems is uncertain on Friday

Weather Forecast

Expect 10-25 mm of precipitation overnight Thursday, with the heaviest amounts in southern coastal part of the region, and freezing levels dropping to 1200 m by Friday morning. Light snowfall is expected to continue for Friday with light to moderate westerly winds. Saturday morning is expected to be unsettled before another storm in the afternoon, with freezing levels remaining around 1200 m. Expect another 10-20 cm by Sunday morning falling under strong southwesterly winds, and an additional 5-10 cm on Sunday with freezing levels remaining around 1200 m. Again, the heaviest snow amounts are expected for the southern coastal parts of the region.

Avalanche Summary

No new avalanches were reported on Wednesday, but poor weather hampered observations. On Tuesday a skier triggered a small storm slab on a NE facing feature around 2000m in the southern portion of the region.

Snowpack Summary

30-50 cm thick fresh heavy storm and thicker wind slabs are poorly bonded to older stiff wind slabs, melt-freeze crusts, or other slippery previous snow surfaces. On sun-exposed slopes and at lower elevations, the snowpack is likely in a spring melt-freeze cycle. A hard crust with weak facets may be lurking as deep as a metre down. This condition seems more specific to the northern parts of the region. Although reports suggest this persistent weakness has gained significant strength, I'd be wary of the possibility of isolated large avalanches on steep, unsupported slopes, especially if temperatures increase, or if solar radiation is strong. The mid-pack is generally well-settled and strong. At the base of the snowpack, weak facets may be found, particularly on shallow alpine slopes in the north of the region. Cornices are large and potentially fragile.

Problems

Storm Slabs

An icon showing Storm Slabs
Any fresh snow will likely be poorly bonded, with particularly deep and weak slabs on the leeward side of ridge crests and terrain features in exposed treeline and alpine terrain.
The new snow will a bit of time to settle and stabilize.>Avoid avalanche terrain during periods of heavy loading from new snow and wind.>Be cautious as you transition into wind affected terrain.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Valid until: Mar 27th, 2015 2:00PM