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Avalanche Forecast

Archived

Feb 7th, 2025–Feb 8th, 2025

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Be careful as you transition into wind-affected terrain.

In sheltered areas, a persistent weak layer may remain triggerable.

Confidence

Moderate

Avalanche Summary

No new avalanche activity has been confirmed since last weekend, but reports have been limited in this region.

Looking forward, we expect naturally triggered avalanches to be unlikely, but human triggering to remain possible.

Snowpack Summary

Wind-effect has been extensive, and wind slabs can be found on various aspects extending well into treeline features. 20 to 60 cm of snow accumulated over the last storm cycle, with the highest amounts falling in the western parts of the region and lowest near Manning Park. A few flurries totaling 2 to 8 cm are expected tomorrow. The old storm snow is sitting on a weak layer that developed in late January. In many areas, this layer consists of a hard crust. However, on shady, upper-elevation slopes, the new snow may be resting on faceted grains or surface hoar. A crust from December is buried 80 to 120 cm deep and may have facets around it in shallow areas. Otherwise, the lower snowpack is well consolidated.

Weather Summary

Friday Night

Partly cloudy. 30 km/h southwest ridgetop wind. Treeline temperatures -13 °C.

Saturday

Cloudy with 2 to 8 cm of snow. 15 to 25 km/h west ridgetop wind. Treeline temperatures -11 °C.

Sunday

Mostly cloudy. 10 to 15 km/h variable ridgetop wind. Treeline temperatures -13 °C

Monday

Sunny. 40 to 50 km/h northeast ridgetop wind. Treeline temperatures -18 °C

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Fresh snow rests on a problematic persistent slab, don't let good riding lure you into complacency.
  • Keep in mind that human triggering may persist as natural avalanches taper off.

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.