In 1956 theoretical meterologist Norman A. Phillips of the National Weather Service, National Meteorological Center, Silver Spring, Maryland, published "The General Circulation of the Atmosphere: A Numerical Experiment," Quarterly Journal of the Royal Meteorological Society 82, no. 352 (1956) 123-164. By 1955 Phillips completed a 2-layer, hemispheric, quasi-geostrophic computer model. "Despite its primitive nature, Phillips's model is now often regarded as the first AGCM" (P. N. Edwards, Atmospheric General Circulation Modeling: A Participatory History, accessed 06-20-2009)
"Norman Phillips was the first to show, with a simple General Circulation model, that weather prediction with numerical models was even feasible. The advent of numerical weather predictions in the 1950s also signaled the transformation of weather forecasting from a highly individualistic effort to one in which teams of experts developed complex computer programs, eventually for high-speed computers" (Franklin Institute, Franklin Laureate database, accessed 06-20-2009).