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Avalanche Forecast

Archived

Mar 30th, 2025–Mar 31st, 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

Sasquatch, Sasquatch, Coquihalla, Harrison-Fraser, Manning, Skagit.

Watch for reactive windslabs as you gain elevation.

Potential remains for large avalanches on buried weak layers, particularly where the snowpack is shallow and thin.

Confidence

Low

Avalanche Summary

Reports have been very limited in this region. On Tuesday, a size 3.5 persistent slab was observed on a north alpine face that likely failed last weekend. Several loose wet avalanches on sunny slopes have also been observed.

Please consider sharing your observations on the MIN.

Snowpack Summary

Up to 25 cm of settling snow sits over wet or crusty surfaces. On all but high north-facing alpine slopes, the upper snowpack is wet. Below 1800 m, it has melted substantially.

A persistent 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 buried 110 to 190 cm. These layers remain a concern, especially in the south and eastern parts of the region where the overall snowpack is shallower. Otherwise, the snowpack is generally well-settled and strong.

Weather Summary

Sunday Night

Increasing cloud. 20 to 40 km/h southeast ridgetop winds. Treeline temperature -2 °C. Freezing level falling to 1500 m.

Monday

Cloudy, with 5 to 10 cm of snow above 1400 m, rain below. 15 to 30 km/h southwest ridgetop winds. Treeline temperature -2 °C. Freezing level 1500 m.

Tuesday

Cloudy, with 5 cm of snow. 20 to 30 km/h southwest ridgetop winds. Treeline temperature -2 °C. Freezing level 1600 m.

Wednesday

Cloudy, with 5 cm of snow. 10 to 2 km/h variable ridgetop winds. Treeline temperature -3 °C. Freezing level 1400 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be alert to conditions that change with elevation, aspect, and exposure to wind.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and slopes above cliffs.
  • Cornice failures could trigger large and destructive avalanches.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.