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Avalanche Forecast

Archived

Jan 25th, 2024–Jan 26th, 2024

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

Regions

Glacier.

Enjoy the warm temps and good quality skiing. Avalanche hazard will rise as conditions change into the weekend with a warm, wet storm approaching.

Confidence

No Rating

Avalanche Summary

Few observations of natural activity over last few days, with isolated activity triggered by southerly winds and high freezing levels in valley bottoms avalanche paths.

Riders have been triggering warm, storm slabs below treeline this week. These avalanches have been small and failing down 30-40 cm on the Jan 3 crust.

Backcountry report of reactive wind slabs up the Asulkan drainage on Wednesday.

Snowpack Summary

Warm temperatures below treeline and wind effect in the alpine & at treeline have created a soft storm slab. This overlies variable wind effect in open terrain at/above Tree-line, and faceted snow in sheltered areas below Tree-line.

A sun crust (Jan 3), down 50cm and most prominent at and below Tree-line on S-SW aspects, has been the failure plane for recent human triggered avalanches.

The Dec 1 surface hoar layer is down ~110cm and is decomposing.

Weather Summary

2 frontal systems impacting the interior on Fri and Sun will bring warm temperature, light to moderate snowfall and S winds.

Tonight: Cloudy, flurries, 5cm snow, Alp low -6°C, light SW winds, 1100m FZL

Fri: Flurries, Trace , Alp high -6°C, light SW winds, 1400m FZL

Sat: Flurries, 8 cm, Alp high -5°C, moderate SW winds, 1800m FZL

Sun: Periods of snow, 15cm, Alp high 0°C, mod to strong S winds, 2200m FZL

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.
  • Be aware of the potential for human triggerable storm slabs at lower elevations, even on small features.

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.

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.