Avalanche Forecast

Issued: Nov 26th, 2022 4:00PM

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

Avalanche Canada dsaly, Avalanche Canada

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Cautiously assess conditions as you travel - the fresh snow will hide reactive slabs or, more likely, early-season hazards.

Summary

Confidence

Low

Avalanche Summary

Last week through Friday, dize 1-2 wind and storm slabs were reactive in wind-loaded and ridge features at upper treeline and above with the past storms. A few loose-wet and snowballing were reported below 2000 m into the BTL.

Looking forward, we expect new storm slabs to become increasingly reactive as snowfall accumulates overnight, first in wind-loaded areas and then becoming widespread Sunday morning.

Snowpack Summary

Overnight snowfall covered wind-affected snow and crust at upper elevations and moist snow and dirt at treeline and below.

Where the snowpack is growing, a weak drought layer is down 20-50 cm. This layer consists of hard, wind-affected snow in the alpine, surface hoar or facetted snow in sheltered areas, and a crust on solar aspects and on all aspects below 2200 m. Below this layer, several other facet-crust interfaces exist in the snowpack.

Terrain features poke through a building snowpack that ranges from 80-150 cm in the alpine and 50-70 cm at treeline. Below treeline is below the threshold for avalanches.

Weather Summary

Saturday night

Heavy precipitation and extreme southwest wind will peak around midnight, then temperatures cool and winds decrease. 15-30 mm precipitation overnight, alpine high -1 C, snow/rain line peaking around 1000 m.

Sunday

Up to 30 cm new snow by morning, and convective flurries possible throughout the day. West wind decreasing to moderate, treeline temperatures dropping to -10 C, and freezing level dropping to valley bottom.

Monday

Cold and sunny, with patchy clouds. Moderate northeast wind, treeline temperatures around -12 C, and freezing level falling to valley bottom.

Tuesday

Cold with a mix of sun and cloud. Light to moderate southerly wind, treeline lows down to -16 C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Investigate the bond of the recent snow before committing to your line.
  • Dial back your terrain choices if you are seeing more than 25cm of new snow.
  • Be especially cautious as you transition into wind affected terrain.

Problems

Storm Slabs

An icon showing Storm Slabs

Likelihood

Likely

Expected Size

1 - 2

Strong winds impacting overnight snow likely formed reactive slabs, the deepest and most reactive deposits will be in open and wind-loaded areas. Be mindful that you may find reactive slabs lower on the slope than usual as a result of the strong winds.

Aspects:

All aspects.

Elevations:

All elevations.

Valid until: Nov 27th, 2022 4:00PM

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