Halvor Solberg (5 February 1895 – 31 January 1974) was a Norwegian meteorologist.
He was born in Ringsaker. He was a central member of the Bergen School of Meteorology, working as meteorologist in Kristiania from 1918. His thesis “Integrationen der atmosphärischen Störungsgleichungen” was published in 1928. He was appointed professor at the University of Oslo from 1930 to 1964. In the 1930s he worked on the theory of tides, atmospheric waves and oscillations, and stability of gas and liquid flow.
He was a fellow of the Norwegian Academy of Science and Letters from 1930, and served as secretary-general from 1946 to 1954. He chaired the Norwegian Geophysical Society from 1937 to 1938
Tor Bergeron (15 August 1891 – 13 June 1977) was a Swedish meteorologist who proposed a mechanism for the formation of precipitation in clouds. In the 1930s, Bergeron and W. Findeisen developed the concept that clouds contain both supercooled water and ice crystals. According to Bergeron, most precipitation is formed as a consequence of water evaporating from small supercooled droplets and accreting onto ice crystals, which then fall as snow, or melt and fall as cold rain depending on the ambient air temperature. This process is known as the Bergeron Process, and is believed to be the primary process by which precipitation is formed.
Bergeron was one of the principal scientists in the Bergen School of Meteorology, which transformed this science by introducing a new conceptual foundation for understanding and predicting weather. While developing innovative methods of forecasting, the Bergen scientists established the notion of weather fronts and elaborated a new model of extratropical cyclones that accounted for their birth, growth, and decay. Bergeron is credited with discovering the occlusion process, which marks the final stage in the life cycle of an extratropical cyclone.
In 1949 he was awarded the Symons Gold Medal of the Royal Meteorological Society. In 1966 he was awarded the prestigious International Meteorological Organization Prize from the World Meteorological Organization.