 George E. Rueppel, S.J., a Catholic lay brother in the Jesuit religious order, who was assistant director of the Meteorological Observatory at SLU, had the primary responsibility for the pre-war stations, and he resumed his duties with the establishment of 9YK.During the war, advances in vacuum tube design now made audio transmissions practical, and 9YK was upgraded to take advantage of this new technology.In late March 1921, it was announced that the United States Weather Bureau, in conjunction with the SLU Department of Science, had received permission from Washington authorities to make twice-daily broadcasts of the official weather reports for Missouri and Illinois, in addition to reporting the local river stages.