Vilhelm Bjerknes

Vilhelm Bjerknes (1862–1951) was a Norwegian physicist and meteorologist who founded the Bergen School of Meteorology and transformed weather forecasting from an empirical art into a physical science based on hydrodynamics and thermodynamics. His key insight was that atmospheric motions could be predicted by applying the laws of fluid mechanics to the large-scale circulation of the atmosphere — the 'primitive equations' that remain the foundation of numerical weather prediction today. Vilhelm's work established the theoretical lineage that his son Jacob Bjerknes would later extend into coupled ocean-atmosphere dynamics and the Bjerknes feedback that underlies the El Niño-Southern Oscillation. The Bergen School also pioneered the concept of weather fronts — the boundaries between air masses of different temperature and humidity — which revolutionized synoptic meteorology and remains central to modern forecasting.