Avalanche Forecast

Issued: Jan 4th, 2019 5:10PM

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

Avalanche Canada mconlan, Avalanche Canada

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Expect rapid changes with elevation. Wind slabs may linger at higher elevations.

Summary

Confidence

Moderate - Due to the number of field observations

Weather Forecast

FRIDAY NIGHT: Mostly cloudy with intermittent snowfall, freezing level below valley bottom.SATURDAY: Mostly cloudy with light snowfall, accumulation trace to 5 cm, light to moderate southwest winds, alpine temperature -6 C, freezing level below valley bottom.SUNDAY: Cloudy with light snowfall, accumulation 5 cm, light west winds, alpine temperature -9 C, freezing level below valley bottom.MONDAY: Partly cloudy, light to moderate west winds, alpine temperature -15 C, freezing level below valley bottom.

Avalanche Summary

There have not been any recent reports of avalanche activity in the south of the region. There were reports of large avalanches in the north of the region, which released during the storm from Monday to Wednesday.We often have a hard time getting reports of avalanche activity from this region, so if you see anything, please post your observations to the Mountain Information Network! (MIN). Thanks!

Snowpack Summary

Strong and variable winds have produced variable surfaces at treeline and alpine elevations. Expect to find wind-scoured surfaces as well as wind slabs in lee terrain features. Below treeline, expect to find a melt-freeze crust near the snow surface.Buried under recent storm snow, you may find a few weak layers in sheltered areas comprising of feathery surface hoar crystals and/or sugary faceted snow. The upper layer was buried around December 31 and is about 20 cm deep. The next layer may have been buried around December 22 and is likely 30-50 cm deep. The lower one was buried in early-December and is now approximately 80-120 cm deep. The bottom 30 to 50 cm of the snowpack consists of weak and sugary faceted grains and crusts, particularly in areas where the snowpack is thin. It is possible that shallower avalanches could scrub down to ground in these thin snowpack areas, due to this weak layer at the base of the snowpack.

Problems

Wind Slabs

An icon showing Wind Slabs
Strong winds have affected treeline and alpine terrain. Wind slabs may linger in the lee sides of terrain features. Should one be triggered, it is possible that it may scour to the ground, particularly in thin snowpack areas.
Be careful with wind-loaded pockets, especially near ridge crests and roll-overs.Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.If triggered, wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible - Likely

Expected Size

1 - 2.5

Valid until: Jan 5th, 2019 2:00PM

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