Tornado: Largest Tornado Outbreak
| Record Value | 148 tornadoes in a 24-hour period |
|---|---|
| Date of Event | 3-4/4/1974 |
| Length of Record | 1787-present |
| Geospatial Location | Central United States (13 states) |
Reference
Grazulis, T.P., 1993: Significant Tornadoes, (St. Johnsbury, VT: The Tornado Project of Environmental Films), pp. 1326
Discussion
Termed the "Superoutbreak." Grazulis's reanalysis of Fujita's count establishes 95 significant tornadoes in this outbreak, 30 of which were F4 or F5 and 48 of the total caused loss of life. Length of record refers to Grazulis's records indicating first documented tornado outbreak in Hartford Connecticut in 1787
Map showing distribution of Superoutbreak tornadoes
GOES satellite image of April 3 weather conditions