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Avalanche Forecast

Archived

Mar 27th, 2025–Mar 28th, 2025

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 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.

Regions

Northwest Coastal, Northwest Inland, Boundary, Stewart, Kispiox, Ningunsaw, Ningunsaw, Ningunsaw.

Stick to low-angle terrain away from overhead hazard. A complex snowpack continues to produce very large avalanches.

Confidence

Moderate

Avalanche Summary

Very large persistent slab avalanches continue to be reported daily around the region. Most notable on Wednesday, included 4 size 1.5-2.5 avalanches that were remotely triggered from up to 350 m away. Many were reported to have failed on the weak layer from early March and others failed on the February drought layer.

A large and widespread wet loose avalanche cycle produced to size 3.5 Tuesday into Wednesday.

Snowpack Summary

Variable wind affect and wind slab covers open terrain at upper elevations. A crust is found up to 1300 m and higher on solar slopes. In protected areas, 40 to 80 cm of recent snow is rapidly settling over a crust, surface hoar and wind-pressed surfaces.

Three layers of concern currently exist in the upper-mid snowpack. Surface hoar that formed in mid-March can be found 40 to 80 cm below the snow surface. Below this, another layer of surface hoar that formed in early March can be found at a depth of 90 to 125 cm. Additionally, a layer of facets, surface hoar, and/or a crust from mid-February is buried 115 to 195 cm deep.

The remainder of the snowpack is well consolidated, and there are no current concerns.

Weather Summary

Thursday Night

Mostly clear. Gusts to 55 km/h east ridgetop wind. Treeline temperature -12 °C. Freezing level dropping to the valley bottom.

Friday

Mostly sunny. 30 to 60 km/h east ridgetop wind. Treeline temperature -3 °C. Freezing level below 600 m.

Saturday

Sunny. 20 to 40 km/h east ridgetop wind. Treeline temperature -3 °C. Freezing level 1000 m.

Sunday

Sunny. 15 to 30 km/h southwest ridgetop wind. Treeline temperature +3 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction, so watch for wind slabs on all aspects.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.
  • Make conservative terrain choices and avoid overhead hazard.

Problems

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.

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.