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Avalanche Forecast

Archived

Apr 5th, 2025–Apr 6th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Little Yoho.

Solar radiation will peak Sunday.

Start early, and finish early while the hazard is lower.

Confidence

Moderate

Avalanche Summary

Visitor safety staff observed evidence of a cornice failure which triggered a size 2 persistent slab in the alpine on the north side of The President which likely occurred Friday.

No other new activity was observed or reported in this subregion on Saturday.

Snowpack Summary

Surface crusts on all aspects to ~2800 m except north, where up to 30 cm of dry snow is found at higher elevations. On southerly aspects, this 30cm contains several crusts.

Below this, a prominent rain crust (Mar 27) is found everywhere up to at least 2300m and ridge top on solar slopes.

This sits on approx 80 cm of firm snow that overlies the Jan 30 facets. These are stronger in Little Yoho than further east but still show potential for propagation with sudden planar test results.

Weather Summary

Daytime solar radiation is the most important input to the snowpack right now.

Tonight: Clear. Alpine temps: Low -6 °C. Mostly light ridge wind occasionally gusting to 30 km/h. Freezing level at valley bottom. Weak temperature inversion.

Sunday: Sunny. Alpine temperature: High 6 °C. Mostly light ridge wind occasionally gusting to 25 km/h. Freezing level up to 3000 metres on soar aspects

Terrain and Travel Advice

  • Start your day early and be out of avalanche terrain during the heat of the day.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.
  • Avalanche danger will increase as the surface crust breaks down.
  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.

Problems

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.