| fujitascale = EF4EF5

A widespread, deadly, and historic{{efn|Tornado expert [[Thomas P. Grazulis]] described this outbreak as "historic" on Twitter.<ref>{{cite web |last1=Grazulis |first1=Thomas |title=2023-03-31 to 04-01…score 122|url=https://twitter.com/sigtor2019/status/1643678995429597187 |website=Twitter |publisher=@sigtor2019 |access-date=5 April 2023}}{{cite web |last1=Grazulis |first1=Thomas |title=11th highest score since 1974 13th of 300+ to make the "historic" level over 120 points |url=https://twitter.com/sigtor2019/status/1643679044485935105 |website=Twitter |publisher=@sigtor2019 |access-date=5 April 2023}}</ref> |group=note|name=Historic}} [[tornado outbreak]] affected large portions of the [[Midwestern United States|Midwestern]], [[Southern United States|Southern]] and [[Eastern United States]] on the last day of March and the first of April, the result of an [[extratropical cyclone]] that also produced blizzard conditions in the [[Upper Midwest]]. Approximately 28 million people were under tornado watches during the evening of March 31, including the [[Central Arkansas|Little Rock]], [[Greater St. Louis|St. Louis]], [[Chicago metropolitan area|Chicago]], and [[Memphis metropolitan area|Memphis]] metropolitan areas.<ref name="NewlyIssued">{{cite tweet|user=NWS|author=National Weather Service|title=With the newly-issued Tornado Watch, now more than 28 million people in a Tornado Watch. Find and follow your local NWS office for the latest at http://weather.gov/socialmedia|url=https://twitter.com/NWS/status/1641890452562403328 |access-date=1 April 2023|date=31 March 2023|number=1641890452562403328}}</ref> The [[National Weather Service]] issued multiple [[Particularly dangerous situation#Tornado watch|PDS tornado watches]] concerning several rounds of [[supercell thunderstorm]]s, many of which produced tornadoes, some of which prompted the issuance of [[tornado emergency|tornado emergencies]] and multiple [[mass casualty incident]]s. Severe and tornadic weather also affected the [[Northeastern United States]] in the afternoon and evening of April 1, including a rare EF3 tornado that caused a death in [[Sussex County, Delaware]]. At certain points of the outbreak, over 20 simultaneous [[tornado warning]]s were active, with a total of 175 tornado warnings being issued on March 31 and an additional 51 issued on April 1. In all, 134 tornadoes touched down; 27 people were killed by these tornadoes with six additional non-tornadic fatalities also taking place. Over 211 injuries occurred during the outbreak as well.