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Avalanche Forecast

Archived

Dec 26th, 2021–Dec 27th, 2021

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

Regions

North Rockies.

Carefully assess the wind slab hazard as you move through the terrain. Wind direction could vary throughout the region on Monday. The Kakwa area will likely see the most reactive wind slabs.

Confidence

Moderate -

Weather Forecast

Sunday night: light east winds except in Kakwa where winds will be moderate from the west. No new snow expected and a low of -32 at 1300m.

Monday: light flurries with light winds except in Kakwa where winds will be moderate to strong from the west. High of -25 at 1300m.

Tuesday: Some flurries ending around noon with light to moderate north winds. high of -23 at 1300m.

Wednesday: light to moderate south winds with flurries throughout the day. High of -16 at 1300m.

Avalanche Summary

On Thursday our field team observed some natural avalanche activity up to size 1.5 in steep or extreme terrain in the treeline while in the southern part of the forecast region.

Explosives on Thursday produced wind slabs up too size 1.5 in treeline and alpine start zones with limited propagation.

Snowpack Summary

Easterly winds will have formed wind slab on west aspects and scoured the east. Cross loading could exist on other aspects. As the winds shift to the west in the Kakwa area new wind slabs could form on east facing slopes.

 

A surface hoar layer up to size 4 was recently buried, it is not yet a problem.

Snowpack depth at treeline typically ranges from 100-250 cm, with the shallower value mainly on the eastern side of the range and the deepest snowpack around Renshaw.

Terrain and Travel

  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.
  • Highmark or enter your line well below ridge crests to avoid wind loaded pillows.
  • Loose avalanches may start small but they can grow and push you into dangerous terrain.

Problems

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.