World Weather/Climate Extremes Website

Tornado: Largest Tornado Outbreak

Record Value 207 tornadoes in a 24-hour period
Date of Event 27/4/2011
Length of Record 1787-present
Geospatial Location Southeastern United States

Reference

US NOAA's Storm Data

Discussion

The official National Oceanic and Atmospheric Administration Storm Data for 27 April 2011 (CST) list tornado numbers:

F0: 62

F1: 77

F2: 33

F3: 20

F4: 11

F5: 4

Total tornadoes for calendar day: 207

In addition, the month of April 2011 also set an record high for the number of US tornadoes for a given month at 760.