Sverre Petterssen, member of the Norwegian School of Meteorology and later one of the three team leaders of James Stagg for the Normandy landings. James Stagg, RAF meteorologist who was responsible for three teams of meteorologists predicting a lull for June 6, 1944, which allowed the landings in Normandy. Carl-Gustaf Rossby, was a Swedish meteorologist foremost known for identifying and characterizing the waves seen in jet streams as well as in the westerlies in the earth's atmosphere, known as Rossby waves, or planetary waves.