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Avalanche Forecast

Archived

Feb 1st, 2025–Feb 2nd, 2025

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

Regions

Coquihalla, Manning, Skagit.

Storm slabs sit over a weak layer and are easily triggerable by riders. Stick to simple, low angle terrain and avoid overhead hazard.

Confidence

Moderate

Avalanche Summary

No recent avalanches have been reported. Snowpack tests in this MIN report from Zoa produced easy shears below the storm snow on Saturday. Storm slabs will likely be triggerable by riders on Sunday.

Snowpack Summary

Light snowfall continues. 25 to 50 cm of new snow has accumulated since Friday. Near ridgetops, moderate to strong southwest wind has loaded new snow into leeward terrain features. The new snow is not expected to bond well to underlying layers including a hard crust, facets and/or surface hoar.

The mid and lower snowpack is well-settled and dense with no other layers of concern.

Weather Summary

Saturday night

Cloudy with 5 to 10 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -9 °C.

Sunday

Cloudy with 5 to 10 cm of snow. 20 to 30 km/h south ridgetop wind. Treeline temperatures -9 °C.

Monday

5 to 10 cm of snow overnight then a mix of sun and cloud. 10 to 20 km/h southeast ridgetop wind. Treeline temperatures -13 °C.

Tuesday

A mix of sun and cloud. 10 to 20 km/h southeast ridgetop wind. Treeline temperatures -13 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep your guard up as storm slabs may remain sensitive to human triggering.
  • Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
  • Closely monitor how the new snow is bonding to the old surface.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.