1842 - Elias Loomis performed an experiment to gain insight into the wind speed needed to defeather a chicken. He loaded a cannon with gun powder and a chicken.
1860 - 500 U.S. telegraph stations are making weather observations and submitting them back to the Smithsonian Institution. The observations are later interrupted by the Civil War.
1920 - Milutin Milankovic proposes that long term climatic cycles may be due to changes in the eccentricity of the Earth's orbit and changes in the Earth's obliquity.
1925 - "Tri-State Tornado" runs through Missouri, Illinois, and Indiana killing 695 people.
1935 - Robert Watson-Watt and his assistant Arnold Wilkins published a report in February 1935, titled The Detection of Aircraft by Radio Methods.
1935 - The "Great Labor Day Hurricane" kills 408 people. It is rated as the most intense Category 5 Atlantic hurricane to make landfall.
1934 to 1937 - The Dust Bowl drought of the US plains region causes harsh economic damage.
1937 - Army Air Forces Weather Service was established (redesignated in 1946 as AWS-Air Weather Service).
1988 - WSR-88D type weather radar implemented in the United States. Weather surveillance radar that uses several modes to detect severe weather conditions.