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Avalanche Forecast

Archived

Apr 11th, 2025–Apr 12th, 2025

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

Regions

North Columbia, South Columbia, Esplanade, Jordan, North Monashee, North Selkirk, Badshot-Battle, Central Selkirk, Goat, Gold, Retallack, Valhalla, Whatshan.

Buried weak layers and wind slabs are a concern, particularly on high north facing slopes where dry snow may tempt you.

Stick to conservative terrain here, free from overhead hazard.

Confidence

Moderate

Avalanche Summary

Recent avalanche actvitiy on the buried surface hoar layer includes naturally triggered slabs to size 3, and human-triggered to size 2, including remote triggers. These occurred on high elevation north facing slopes in the Selkirks.

Loose wet and wind slabs were also observed, triggered naturally and by riders.

Snowpack Summary

15 to 35 cm of recent storm snow exists at treeline and above. Moist snow exists up to 2200 m on north facing slopes and to ridgetop on sun affected slopes.

A layer of surface hoar can be found 30-70 cm deep, in terrain above 2300 m. This has been reactive to human triggering on high north through east-facing slopes.

Several melt freeze crusts can be found throughout the upper snowpack. Weak layers buried in early March, February, and January are now anywhere from 150 cm to 250 cm deep.

Weather Summary

Friday Night

Cloudy with isolated flurries. 25 to 35 km/h southwest ridgetop wind. Freezing level drops to 1000 m.

Saturday

Cloudy with 5 to 10 cm of snow possible. 30 to 40 km/h west ridgetop wind. Treeline temperature -4 °C. Freezing level 1500 m.

Sunday

Mostly clear skies. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1900 m.

Monday

Mostly clear skies. 20 to 40 km/h southwest ridgetop wind. Treeline temperature +4 °C. Freezing level 2500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.

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.