Europe Records 146 Avalanche Deaths as Persistent Weak Layer Drives Dangerous Season

Europe's Avalanche Season Claims 146 Lives in Pattern of Persistent Instability

The 2025-26 European ski season ended with 146 avalanche deaths across the Alps, Apennines, Pyrenees, and Scandinavian Mountains - more than double the 70 fatalities recorded the previous winter. The primary culprit wasn't extraordinary snowfall or massive storm cycles, but rather a persistent weak base layer that formed early in the season and refused to stabilise for months.

Whilst some media outlets labelled this a record season, the statistical reality is more nuanced. The 20-year average for European avalanche deaths sits at 104.35, with a standard deviation of 35.64 - meaning seasonal variability between 69 and 140 deaths falls within normal statistical range. This season's toll exceeded that range only marginally. The winter of 2009-10 remains the actual outlier, with 194 deaths across Europe.

The Structural Problem That Defined the Season

What distinguished this season wasn't a single catastrophic event but a pattern avalanche forecasters recognise all too well. Thin, inconsistent snowfall across much of the Alps during late November and December created a deeply buried persistent weak layer - what German-speaking forecasters call "Altschneeproblem" (old snow problem). This fragile layer, typically composed of faceted snow crystals, can persist for months and proves notoriously difficult to stabilise.The danger remained relatively contained through early winter, with fatalities staying low through December. But beneath the surface, conditions were deteriorating. When significant fresh snow finally arrived after a prolonged dry period in mid-January, it loaded slopes rapidly whilst placing stress on that buried weak layer.