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Avalanche Forecast

Archived

Feb 25th, 2024–Feb 26th, 2024

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

Regions

Little Yoho.

The danger has risen due to 15-35cm of new snow and strong winds. Winds will die off on Monday, and the natural cycle should taper. Conditions will remain ripe for human triggering.

Confidence

Moderate

Avalanche Summary

There were limited field observations on Sunday due to visibility, but on Saturday, without the new snow, there were reports of climbers remotely triggering a size 1 on Super Bock. Further East, many reports of new snow avalanches on the Feb 3 crust and Little Yoho is likely similar, and we suspect a natural cycle is occurring up high.

Snowpack Summary

Recent strong winds and 15-35cm of new snow have resulted in widespread slab formation, suspected at all aspects and elevations (limited observations on Sunday). In sheltered areas, 25-50+cm of snow now overlies the Feb. 3 crust and facets, which can be found on all aspects to 2500m and higher on solar aspects. This crust ranges from 1cm to 15cm in thickness. In shallower snowpack areas, weak facet layers can be found in the mid and lower snowpack.

Weather Summary

Monday - Winds becoming light NW switching SW, and 5-7cm by the end of the day. Temperatures will start to cool

Tuesday - Trace amounts of snow and light SW winds. Temperatures -10C to -15C in the AM

Wednesday - A few cm of snow and warming temperatures as another system approaches.

For more information, see AvCan's Mt Wx

Terrain and Travel Advice

  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.