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Avalanche Forecast

Archived

Dec 23rd, 2023–Dec 24th, 2023

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

Regions

North Rockies, Kakwa, McGregor, Pine Pass, Renshaw, Robson.

Continuously assess conditions as you move through terrain. Watch for signs of instability.

New snow amounts vary through the region, there's uncertainty in reactivity of surface hoar.

Confidence

Low

Avalanche Summary

Several rider triggered slab avalanches have been reported in this region. Take a look at this MIN detailing Avalanches in the Torpy. We suspect that these avalanches ran on one of the surface hoar layers in the top meter of the snowpack.

Snowpack Summary

Recent storm snow has been redistributed into wind slab near ridge crests by southerly winds. Below treeline a new crust is on or near the surface.

The mid pack contains several layers of note; a layer of surface hoar and a crust down 20 to 30 cm , a significant crust from the early December rain event down around 50 cm and a layer of surface hoar down 60 to 100 cm.

Snowpack depth throughout this region is highly variable and as a result the depths of the above mentioned layers are approximate and could be different than what you find in your riding area.

Weather Summary

Saturday Night

Mostly clear skies with no new snow expected, southeast alpine wind 15 to 30 km/h, treeline temperature -7°C.

Sunday

A mix of sun and cloud with no new snow expected,  southeast alpine wind 20 to 40 km/h, treeline temperature -4°C.

Monday

Mostly sunny with no new snow expected, southeast alpine wind 20 to 40 km/h, freezing level rising to 2000 m.

Tuesday

A mix of sun and cloud with trace amounts of new snow expected, southwest alpine wind 25 to 60 km/h, freezing level around 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • Carefully assess open slopes and convex rolls where buried surface hoar may be preserved.
  • Be carefull around freshly wind loaded features.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Uncertainty is best managed through conservative terrain choices at this time.

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.