Avalanche Forecast

Issued: Jan 26th, 2019 3:38PM

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

Avalanche Canada mconlan, Avalanche Canada

Continue to think about and observe for signs of the lingering weak layer buried in our snowpack.

Summary

Confidence

High -

Weather Forecast

SATURDAY NIGHT: Partly cloudy, freezing level dropping to 1500 m.SUNDAY: Mostly clear skies, moderate northwest winds, alpine temperature near -2 C, freezing level 1400 m.MONDAY: Increasing clouds over the day, light northwest winds, alpine temperature -3 C, freezing level below valley bottom.TUESDAY: Mostly clear skies, light northwest winds, alpine temperature -1 C, freezing level below valley bottom with inversion conditions possible.

Avalanche Summary

On Friday, One small slab avalanche was triggered by a skier on the surface hoar described in the Snowpack Summary was triggered by a skier. Otherwise, small loose wet avalanches were observed. Check out the following MIN reports for other recent reports of avalanches on the surface hoar: here and here.

Snowpack Summary

On the snow surface, you will likely find a sun crust on south aspects but still dry snow on northerly aspects. Beneath this, around 30 to 60 cm of snow sits on a sun crust on southerly aspects, a temperature crust below around 1700 m on all aspects, and feathery surface hoar in areas sheltered by the wind at all elevation bands. The surface hoar may be most pronounced on west, north, and east aspects below 2100 m.Below this, the snowpack is generally well-settled. In certain parts of the region, you may still find a weak layer of surface hoar buried about 60 to 120 cm in sheltered areas around treeline. There haven't been any recent avalanches on this layer but the likelihood of triggering it may increase this weekend with warm air temperatures.

Problems

Persistent Slabs

An icon showing Persistent Slabs
Around 30 to 60 cm of snow sits above a weak layer of surface hoar. This layer is likely best preserved in shaded and sheltered areas between 1700 m and 2100 m. Where it exists, it could still be triggered by humans.
Pay attention to overhead hazards like cornices, which could easily trigger persistent slabs.Watch for signs of instability such as whumpfing, cracking, or recent avalanches.Make observations and assess conditions continually as you travel.

Aspects: North, North East, East, West, North West.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 2

Valid until: Jan 27th, 2019 2:00PM

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