November 1, 1848
Circular on Meteorology, by Secretary Joseph Henry and James P. Espy is published. They announce the establishment of a system of meteorological observations, focusing on American storms, and request those interested in volunteering as observers to contact the U.S. Navy Department. Secretary Henry proposes to use the magnetic telegraph to notify distant observers of approaching storms. The system of telegraphic dispatches of weather conditions will begin the next year. This program leads to the foundation of the National Weather Service.