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Avalanche Forecast

Archived

Apr 16th, 2025–Apr 17th, 2025

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

Regions

Little Yoho.

Cool temperatures are forecast for Thursday, but pay attention to solar radiation and how quickly the day is warming up. Some loose wet avalanches may occur if day is warmer then forecasted.

Plan on starting and finishing your day early.

Confidence

Moderate

Avalanche Summary

No recent slab avalanches reported in the past four days.

Snowpack Summary

Crusts on solar aspects to ridgetop, with crusts on all aspects at treeline and below. 20-40 cm of dry snow on north-facing alpine slopes with some wind slabs in alpine lee areas.

A stiff midpack sits over a weaker layer of Jan facets in some places, but this is mainly a concern in thin snowpack areas. On all but high north aspects, crusts in the upper snowpack overlay this midpack slab. If these crusts are thick, and remain frozen, they provide good strength over the weakness.

Weather Summary

Thursday - mix of sun and cloud, cool temperatures (alpine highs -3°C), light northerly winds, and freezing levels 1900 - 2000 m.

Friday - will see mostly sunny skies, warmer temperatures (alpine highs -1°C), light westerly winds, and freezing levels to 2400 m.

Saturday - slightly cooler, cloudy skies and light flurries, up to 5-10 cm possible.

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.