Avalanche Forecast

Issued: Apr 19th, 2014 9:30AM

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

Avalanche Canada rbuhler, Avalanche Canada

Summary

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Unsettled conditions are expected for Sunday. Monday might see a weak ridge form resulting in dry conditions or the unsettled conditions may persist. The next organized system is expected to arrive on the south coast on Monday night and light precipitation is expected for Tuesday. Freezing levels are expected to be lower in the north of the region.Sunday: A mix of sun and cloud, light scattered precipitation, freezing level am: 1300m pm: 1700m, ridgetop wind: light S-SWMonday: A mix of sun and cloud, light scattered precipitation, freezing level am: 1700m pm: 2300m, ridgetop wind: moderate S-SWMon. Night/Tuesday: Precipitation 3-5mm, freezing level am: 1700m pm: 1700m, ridgetop wind: light S-W

Avalanche Summary

We received 2 reports of avalanche activity in the Duffy Lake Road area on Friday. This includes a natural size 1.5 wind slab released from a steep north facing couloir, a skier triggered size 2.5 storm slab on a north aspect, and a skier triggered size 1 storm slab which released down 30cm. Public observations are really appreciated this time of year. If you are out in the mountains, please send your observations to forecaster@avalanche.ca.

Snowpack Summary

New snow is sitting on a melt-freeze crust which exists on all aspects up to 2000m, and to mountain-top on solar aspects. The recent warmer temperatures have helped to strengthen and settled the upper snowpack, especially on solar aspects. The upper snowpack is expected be moist at treeline and wet/isothermal below treeline. Where dry snow exists, recent SW winds have formed wind slab in leeward features. Large sagging cornices remain a concern, especially during periods of warming. The February crust/facet layer is now deeply buried 150-250 cm below the surface. This layer is mostly inactive at this time, but could re-awaken with extended warming, solar influence and large triggers like cornice fall.

Problems

Storm Slabs

An icon showing Storm Slabs
New snow may have formed storm slabs at higher elevations. Stiffer wind slabs have formed in leeward alpine terrain features from moderate-strong S through W winds.
Make observations and assess conditions continually as you travel.>Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 3

Loose Wet

An icon showing Loose Wet
Rain at lower elevations will saturate and destabilize the upper snowpack. Loose sluffing from steep terrain features is possible, especially from human-triggering.
Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.>Be cautious of sluffing in steep terrain.>

Aspects: All aspects.

Elevations: Alpine.

Likelihood

Unlikely - Possible

Expected Size

1 - 2

Valid until: Apr 20th, 2014 2:00PM

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