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Avalanche Forecast

Archived

Mar 13th, 2025–Mar 14th, 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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Cariboos, Blue River, Clearwater, Premier, Quesnel, Clemina, North Monashee.

Choose conservative terrain, as the likelihood of triggering large avalanches remains high.

Confidence

Moderate

Avalanche Summary

Two large (size 2) naturally triggered persistent slab avalanches were observed in the alpine near Valemount on Tuesday. These occurred on east aspects, were 100 cm deep, and failed on the buried weak layer noted in the snowpack summary.

Throughout the week riders and explosives continued to trigger small to large (size 1-3) storm slab avalanches within the recent storm snow. Most occurred on north to east aspects between 1900 and 2100 m, with depths ranging from 50 to 80 cm.

Snowpack Summary

60 to 90 cm of storm snow has accumulated since Saturday. All this snow sits on a hard melt-freeze crust found everywhere except north-facing slopes above 1600 m. There may also be isolated surface hoar crystals above the crust in wind-sheltered terrain around treeline. Southwest wind may form deeper and touchier deposits in lee terrain features at high elevations.

A weak layer of surface hoar and/or faceted grains buried mid-February is around 70 to 120 cm deep.

The lower snowpack is well-settled.

Weather Summary

Thursday Night

Cloudy with 2 to 5 cm of snow. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -8 °C.

Friday

Mix of sun and cloud with 1 to 3 cm of snow. 10 to 20 km/h south ridgetop wind. Treeline temperature -8 °C.

Saturday

Mostly cloudy with 2 to 5 cm of snow. 20 to 30 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Sunday

Mostly cloudy with 2 to 5 cm of snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks, or recent avalanches.

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.