Winter of Terror (1950-1951)
A three-month period saw 649 avalanches kill over 265 people across Austria, Switzerland, and Italy. On January 20, 1951, over 45,000 people were trapped when a series of avalanches struck simultaneously. Austria lost 135 people; Switzerland lost 98 and saw 1,000 buildings destroyed.
The disaster prompted emergency international coordination and massive rescue operations involving military forces from multiple nations.
Switzerland established the modern avalanche warning system. Protection forests were planted on critical slopes, hazard maps developed, and the SLF expanded its forecasting. When similar conditions recurred in 1999, fatalities were far lower.
The 1951 disaster created the institutional infrastructure—warning services, danger scales, trained personnel—that exists today. January 2026's deaths occurred despite this system working as designed, raising questions about the limits of warning efficacy when skiers choose to ignore forecasts.