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。它是产生龙卷风的超级单体的经典特征之一。国家气象局可能认为钩状回波与龙卷式涡旋特征（英语：tornado vortex signature）同时出现时足以发布龙卷风警报（英语：tornado warning）。 Glickman, Todd S. (编). Hook Echo. Glossary of
NWS Moore/South OKC 2013 Tornado Warning（页面存档备份，存于互联网档案馆） from the National Weather Service in Norman, Oklahoma Map of tornado path and damage（页面存档备份，存于互联网档案馆）
44 (4) [14 December 2023]. Mathis, Nancy. A Tornado Forecast. Storm Warning: The Story of a Killer Tornado. Touchstone. 2007: 46–50. ISBN 978-0-7432-8053-2
R. J. Donaldson Jr., and P. R. Desrochers, 1993: Tornado detection and warning by radar. The Tornado: Its Structure, Dynamics, Prediction, and Hazards
23, 2022 [March 28, 2022]. （原始内容存档于2022-06-08）. PAGASA to put up tornado warning system. GMA News Online. 2007-08-07 [2014-02-15]. （原始内容存档于2009-10-05）