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References:
[1] https://worldpopulationreview.com/country-rankings/what-countries-have-tornadoes
[2] https://www.weather.gov/media/pah/Skywarn/TORNADOsafety.pdf
[3] https://en.wikipedia.org/wiki/2011_Super_Outbreak
[4] https://www.nssl.noaa.gov/users/brooks/public_html/papers/deathhist.pdf
[5] https://weather.com/storms/tornado/news/2021-04-05-tornado-warning-nws-accuracy
[6] https://www.nssl.noaa.gov/education/svrwx101/tornadoes/
[7] https://www.nssl.noaa.gov/projects/vortex2/
[8] https://www.spc.noaa.gov/faq/tornado/
[9] https://www.spc.noaa.gov/faq/tornado/ef-scale.html
[10] https://weather.com/safety/tornado/news/2021-03-19-record-breaking-tornadoes-us
[11] https://en.wikipedia.org/wiki/1999_Bridge_Creek%E2%80%93Moore_tornado
[12] https://www.weather.gov/pah/1925Tornado_ss
[13] https://en.wikipedia.org/wiki/2013_El_Reno_tornado
[14] https://journals.ametsoc.org/view/journals/mwre/138/7/2010mwr3201.1.xml?tab_body=fulltext-display
[15] https://www.nssl.noaa.gov/research/tornadoes/
[16] https://www.earth.com/news/radar-signature-will-improve-tornado-forecasting/