The tornadoes, which touched down across the Tri-State, were part of a super outbreak of twisters which killed 315 people in 13 states. Super tornado outbreak of 1974. The “Super Outbreak of April 3-4, 1974” occurred across portions of the Midwest, Lower Mississippi Valley, and Southeast. In what was the worst tornado outbreak of the 20 th century, there were 148 tornadoes over the course of just 18 hours, over half of which were classified as significant/strong at F2 strength or higher. Many comparisons have been made between this outbreak and the.

For the video game, see.A tornado outbreak is the occurrence of multiple spawned by the same weather system. The number of tornadoes required to qualify as an outbreak typically are at least six to ten.The tornadoes usually occur within the same day, or continue into the early morning hours of the succeeding day, and within the same region. Most definitions allow for a break in tornado activity (time elapsed from the end of last tornado to the beginning of next tornado) of six hours. If tornado activity indeed resumes after such a lull, many definitions consider the event to be a new outbreak. A series of continuous or nearly continuous tornado outbreak days is a. Tornado outbreaks usually occur from March through June in the of the United States and Canada, the, and the in an area colloquially referred to as.

Tornado outbreaks do occur during other times of the year and in other parts of the world, however. A secondary less active and annually inconsistent tornado 'season' in the U.S. Occurs in late autumn.The largest tornado outbreak on record was the, with 362 tornadoes and about $10 billion in direct damages. It surpasses the, in which 148 tornadoes were counted. Both occurred within the. The total number of tornadoes is a problematic method of comparing outbreaks from different periods, however, as many more weaker tornadoes, but not stronger tornadoes, are reported in the US in recent decades than in previous ones due to improvements in tornado detection.

References. Glickman, Todd S. (ed.) (2000). American Meteorological Society.

Archived from on 2011-06-06. CS1 maint: extra text: authors list. (1993).

Significant Tornadoes 1680-1991: A Chronology and Analysis of Events. Johnsbury, VT: The Tornado Project of Environmental Films. (1977). 'Some Climatological Aspects of Tornado Outbreaks'. 105 (4): 477–84.:. Schneider, Russell; H. Schaefer (2004).

22nd Conference on Severe Local Storms. Hyannis, MA: American Meteorological Society. Schneider, Russell; H.

Schaefer (2004). 22nd Conference on Severe Local Storms. Hyannis, MA: American Meteorological Society. (2007). Electronic J. Severe Storms Meteor. 2 (5): 1–16.Further reading.

Corfidi, Stephen (2013). NOAA-NWS-NCEP Storm Prediction Center (poster). Cite journal requires journal=.; R. Edwards; R.L. Thompson; J.A. Crosbie (2006). 'A Simple and Flexible Method for Ranking Severe Weather Events'.

Weather Forecast. 21 (6): 939–51.; R. Doswell (2004). 22nd Conference on Severe Local Storms. Hyannis, MA: American Meteorological Society. (2006).

Midas gold plus cheat. Rebirth Items (341).

Symposium on the Challenges of Severe Convective Storms. Atlanta, GA: American Meteorological Society. Mercer, Andrew E.; C.M. Doswell III; L.M. Richman (Dec 2009). 'Objective Classification of Tornadic and Nontornadic Severe Weather Outbreaks'.

137 (12): 4355–68. (1979). 'The Climatology and Synoptic Meteorology of Southern Plains' Tornado Outbreaks'. Norman, OK: University of Oklahoma.

Shafer, Chad; C.A. Doswell (2010). Electronic J. Severe Storms Meteor.

5 (1). Shafer, Chad; C. Richman (2010). Electronic J. Severe Storms Meteor. 5 (7).

Shafer, Chad; C. Doswell (2011). Electronic J. Severe Storms Meteor.

6 (2). Thompson, Richard L.; M.D. Vescio (1998). 'The Destruction Potential Index – a method for comparing tornado days'. 19th Conference on Severe Local Storms.

Minneapolis, MN: American Meteorological Society. Verbout, Stephanie M.; H.E. Schultz (2006). 'Evolution of the U.S. Tornado Database: 1954-2003'.

Weather Forecast. 21 (1): 86–93.External links.