Cycloidal marks

Cycloidal marks, also known as cycloidal damage swaths, are lineo-circular piles of debris that are produced by some powerful multiple-vortex tornadoes.^[1][2] Cycloidal marks are typically an indication that a tornado possessed suction vortices. Notable tornadoes that have produced cycloidal marks include the 2008 Parkersburg–New Hartford tornado,^[3] 2016 Dodge City tornadoes and the 2022 Nullarbor Plain tornado.^[4][5] Cycloidal marks created by dust devils have been documented on Mars by the Mars Global Surveyor.^[6][7]

Circular cycloidal marks observed following an F4 tornado near Scottsbluff, Nebraska in 1955

See also

• Tornado intensity
• Tornado damage survey