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Avalanche Forecast

Archived

Mar 28th, 2025–Mar 29th, 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, 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

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 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 avalanches 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 1400 m and higher on solar slopes.

Three layers of concern currently exist in the upper-mid snowpack. Surface hoar and a crust that formed in mid-March can be found 30 to 70 cm below the snow surface. Below this, another layer of surface hoar that formed in early March can be found at a depth of 60 to 100 cm. Additionally, a layer of facets, surface hoar, and/or a crust from mid-February is buried 120 to 200 cm deep.

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

Weather Summary

Friday Night

Increasing clouds. 20 to 40 km/h southeast ridgetop wind. Treeline temperature -18 °C.

Saturday

Mostly sunny. 20 to 40 km/h east ridgetop wind. Treeline temperature -4 °C. Freezing level near 800 m.

Sunday

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

Monday

Sunny. 5 to 15 km/h southwest ridgetop wind. Treeline temperature +6 °C. Freezing level 1900 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • 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.
  • Cornice failures could trigger large and destructive avalanches.

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.