Avalanche Forecast

Issued: Dec 9th, 2023 1:15PM

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

Avalanche Canada matt, Avalanche Canada

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We are still in the human triggering phase of this storm cycle. Tread lightly as you approach windy areas.

Summary

Confidence

Moderate

Avalanche Summary

Numerous loose dry avalanches today out of very steep, rocky terrain. Most were modest size 2's and didn't travel very far.

More notably, a couple of wind slab avalanches were seen today. Again. east aspects and on slopes below major cliffs. Wide propagations were noted with sizes up to 2.

Snowpack Summary

We keep skipping around the region trying to get a handle on the distribution and character of our new and improved snowpack. Today took us to the lower Tent Ridge area. Similar to the east side of the road, snow depths are less than other areas. Only 55cm of total snow at 2200m with a crust down 23cm. Hard to extrapolate a ton of info out of this site, but what seems to be the common thread among all areas is the buried crust down 22-55cm. So far the bond is doing well with no sign of weakness yet. This will certainly be the layer to watch. In particular the upper extent of it. Where the crust disappears will become critical information in the next while. Wind slabs above this elevation will be touchier and easier to trigger.

As we were leaving the field at 1pm, the winds were just starting to pick up and undoubtedly forming fresh wind slabs in lee (east) areas.

Weather Summary

Winds will fade tonight, and continue slowing down tomorrow. Treeline winds will settle into the moderate range (30km/hr+) tomorrow and be out of the west. As winds drop, temperatures will rise slightly for a daytime high of -8. A few flurries will blow through, but accumulation will be minimal.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Approach lee and cross-loaded slopes with caution.

Problems

Wind Slabs

An icon showing Wind Slabs

New wind slabs will continue to build near ridges and cols. Expect them to extend well below the actual ridge line.

Aspects: North, North East, East, South East.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1.5 - 2.5

Persistent Slabs

An icon showing Persistent Slabs

Wind transport will redistribute the storm snow which will change the loading pattern and stress on this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1.5 - 2.5

Valid until: Dec 10th, 2023 4:00PM

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