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Avalanche Forecast

Archived

Dec 12th, 2022–Dec 14th, 2022

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Kananaskis, Bow Valley, Highwood Pass, North 40, Spray - KLakes.

This snowpack is going to take some time to fix itself. Settle in and remind yourself that its just good to be outside, regardless of ski quality. Check out our latest snowpack tests at: https://www.instagram.com/kananaskissafety/?hl=en

Confidence

High

Avalanche Summary

Nothing new today.

Snowpack Summary

Today the forecasters went up towards the Dogleg and dug a profile at 2100m. There was 80cm of total snow with a fresh crop of surface hoar growing on the surface. The layer of concern is the November 16 surface hoar that was found sitting on the weak 50cm of basal facets. Check our Instagram video of some fascinating tests at: https://www.instagram.com/kananaskissafety/?hl=en

There is some variation in the snowpack depending whether you are on the east or west side of the Spray Lakes Road. There also might be a thin sun crust on solar aspects. What is consistent everywhere is that we have a really weak snowpack that consists of 50cm of facets on the ground with weak layers above that are either surface hoar and/or facets. With the nature of our persistently poor snowpack, any improvement will be measured in weeks, not days. As the surface snow stiffens (either from wind, temperature or settlement) it will bridge the weak layer below. This will give the illusion that our snowpack is improving, but in fact its actually going to be more reactive and unpredictable. The trick to managing our delicate snowpack will be monitoring the upper snowpack characteristics and using terrain to manage the uncertainty.

Weather Summary

Tuesday morning will start off at -16c and warm up to -5c with flurries beginning in the afternoon. Winds will be moderate from the NW. Wednesday is forecasting for 7cm of snow.......

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.
  • Avoid convexities, steep unsupported terrain and rocky outcroppings.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.
  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Watch for areas of hard wind slab on alpine features.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.