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Avalanche Forecast

Archived

Mar 25th, 2025–Mar 26th, 2025

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

Regions

Coquihalla, Manning, Skagit.

Avoid all avalanche terrain during periods of high hazard.

Rain and high freezing levels can trigger avalanches on buried weak layers.

Confidence

Moderate

Avalanche Summary

On Monday, numerous natural wet loose avalanches up to size 2 were reported in the southern part of the region. Check out this MIN report for more details.

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

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

Tuesday Night

Cloudy. 15 to 45 km/h south ridgetop winds. Treeline temperature 5 °C. Freezing level 1300 m.

Wednesday

Mostly cloudy with light rain. 15 to 20 km/h south ridgetop winds. Treeline temperature 10 °C. Freezing level rises to 3200 m.

Thursday

Cloudy with wet snow 5 to 10 cm above 1800 m. 15 to 50 km/h south ridgetop winds. Treeline temperature 4 °C.

Friday

Cloudy with snow 5 to 10 cm above 1500 m. 15 gusting to 65 km/h southeast ridgetop winds. Treeline temperature 4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid exposure to overhead avalanche terrain; avalanches may run surprisingly far.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.
  • Keep in mind that the high density of wet avalanches can make them destructive.

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.