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Avalanche Forecast

Archived

Apr 2nd, 2023–Apr 3rd, 2023

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

Regions

Sea To Sky, Brandywine, Homathko, Spearhead.

Spring is a dynamic time of year where conditions can vary widely and change rapidly. Localized convective snowfall can appear out of nowhere and even short periods of strong sun can rapidly destabilize the upper snowpack.

Carefully assess your local conditions and pay attention to how the weather is affecting the snowpack throughout the day.

Confidence

Moderate

Avalanche Summary

On Friday and Saturday, small (size 1) storm slabs and loose dry sluffing were reactive to skier traffic. Explosive control work on Saturday produce mostly size 1 storm slabs, with a few size 1.5-2. Greatest reactivity has been in wind loaded areas in the alpine.

Prior to the most recent storm, cornices and wind slabs were reactive. Several cornice failures triggered size 2-3 wind slabs in the alpine. Several skier-triggered wind slabs were reported from north and west aspects.

Snowpack Summary

A moist or crusty surface has likely formed on southerly aspects and below 1000 m. 15 to 30 cm of recent snow has likely been blown into deep deposits in leeward terrain features at wind-exposed elevations by previous strong southeast to southwest winds. The recent snow sits over a variety of surfaces that include a heavily wind-affected alpine and treeline and a crust at lower elevations and solar aspects.

The middle of the snowpack is strong and bonded. At the bottom of the snowpack, a layer of weak facets remains present and continues to be monitored for signs of reactivity.

Weather Summary

Sunday night

Partly cloudy with convective flurries accumulating a few cm. Alpine low -10 °C. Light northerly wind. Freezing level valley bottom.

Monday

Mostly sunny. Light southwest wind. Alpine high -1 °C. Freezing level rises to 1300 m.

Tuesday

A mix of sun and cloud. Light variable wind. Alpine high -1 °C. Freezing level rises to 1300 m.

Wednesday

Mostly cloudy. Light to moderate southwest wind. Alpine high -5 °C. Freezing level rises to 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Keep in mind that human triggering potential persists as natural avalanching tapers off.
  • Be especially cautious as you transition into wind affected terrain.
  • Remember that in the spring strong solar radiation and warm temperatures can weaken the snow in a matter of minutes.
  • Avoid slopes when the solar radiation is strong, especially if they have large cornices overhead.

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 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.