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Avalanche Forecast

Archived

Mar 24th, 2025–Mar 25th, 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 unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Coquihalla, Manning, Skagit.

Rain heavily loads the snowpack, testing buried weak layers for the first time.

Conservative terrain selection is essential.

Confidence

Moderate

Avalanche Summary

We expect a natural avalanche cycle to continue with rain destabilizing the snowpack.

On Saturday, a skier was involved in a storm slab avalanche, up to 60 cm deep, near July Mountain.

Thank you for sharing your observations to the MIN.

Snowpack Summary

10 mm of rain is expected to create moist surfaces on all aspects and elevations. This falls on 40 to 60 cm of settling storm snow which was redistributed into deeper deposits on north- and east-facing slopes by strong southwest winds. This sits atop 80 to 100 cm of settled snow on north-facing slopes, and several thin melt-freeze layers on south-facing slopes.

A supportive crust is found below this, on all aspects except on high, north-facing alpine terrain. Snow is reportedly bonded well to it.

A weak layer of facets and surface hoar from February is now 90 to 150 cm deep and a layer of facets and surface hoar from late January is 110 to 190 cm deep. Some recent planar results were reported in the Manning Park area.

Weather Summary

Monday Night

Cloudy with 5 to 10 mm, falling as snow above 2000 m, locally greater amounts near Chilliwack. 30 to 40 km/h southwest ridgetop winds. Treeline temperature 2 °C.

Tuesday

Mostly cloudy with up to 3 mm. 40 to 50 km/h southwest ridgetop winds. Treeline temperature 5 °C. Freezing level rising to 3000 m.

Wednesday

Partly cloudy with possible light rain, trace amounts. 30 km/h south ridgetop winds. Treeline temperature 7 °C.

Thursday

Cloudy with 5 to 10 mm. 40 to 60 km/h south ridgetop winds. Treeline temperature 4 °C. Freezing level drops to 1600 m throughout the day.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Conservative terrain selection is critical; choose gentle, low consequence lines.
  • Use extra caution for areas that are experiencing rapidly warming temperatures for the first time.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.

Problems

Wet Slabs

Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.

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.