The 2020 April 1-9 North Texas-South Oklahoma Tornado Outbreak was the longest outbreak ever recorded, lasting for 9 days. With the strongest tornado being an EF7, that was measured with winds of 300 mph, it was measured in a tornado out in the border of Oklahoma and Texas. it originated from a huge supercell that formed over the Borders of Oklahoma and Texas. spawning the first tornado in April 1 3:46 UTC and the last tornado to dissipated in April 9 5:31 UTC