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Avalanche Forecast

Archived

Jan 24th, 2020–Jan 25th, 2020

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

Regions

North Rockies.

The main concern is wind slabs at upper elevations. Previous wind has created slabs on a variety of aspects.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

FRIDAY: Scattered flurries, moderate to strong wind from the southwest, freezing level up to 1500 m and alpine high temperatures around -3 C.

SATURDAY: Mainly cloudy with isolated flurries, moderate to strong wind from the southwest, freezing level up to 1500 m and alpine high temperatures around -2 C.

SUNDAY: Mainly cloudy with isolated flurries, moderate wind from the southwest, freezing level up to 900 m and alpine high temperatures around -4 C.

MONDAY: Mainly cloudy, light to moderate wind from the south, freezing level up to 900 m and alpine high temperatures around -4 C.

Avalanche Summary

There have been no reports of avalanche activity in the past few days.

There have also been a number of glide slabs that failed naturally as very large avalanches in the Torpy area recently. Glide cracks are seemingly unpredictable and need to be given a wide berth. There are some great photos on the PGBCSki FB page. Mild temperatures heading into this weekend could increase the sensitivity of glide slabs.

Snowpack Summary

Recent snow has settled with warm temperatures and been blown around by wind from various directions, resulting in wind slabs on all aspects at and above treeline. A weak layer of surface hoar buried in late December remains a concern but seems to be gaining strength. The layer has been found across much of the North Rockies region, but has seemed to be more acute in particular areas, such as around McBride and the McGregors/Torpy. It seems to be most readily found in sheltered treeline features 50 to 150 cm below the surface.

Terrain and Travel

  • Be careful as you transition into wind affected terrain.
  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.
  • Avoid steep slopes when air temperatures are warm, or solar radiation is strong.

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.