What is Hook echo?
[[Image:Tornadic classic supercell radar.gif|thumb|250px|right|A hook echo on the radar image of the May 3, 1999 supercell thunderstorm that produced an [[Fujita scale|F5]] tornado in [[Moore, Oklahoma]].]] A '''hook echo''' is a [[fishing hook|hook]] shape seen on a [[weather radar]] of some [[supercell|supercell thunderstorm]]s. It is produced by [[rain]], [[hail]], or even [[debris]] wrapping around the thunderstorm.<ref>{{cite book |editor-last = Glickman |editor-first = Todd S. |title = Glossary of Meteorology |publisher = American Meteorological Society |edition = 2nd |year = 2000 |location = |pages = |url = http://glossary.ametsoc.org/wiki/Hook_echo |doi = |isbn = 978-1-878220-34-9 }}</ref> A hook echo is a sign that a [[tornado]] has formed or is forming. If a hook echo is seen on radar, the [[National Weather Service]] may issue a [[tornado warning]].<ref>{{cite web |last = Angel |first = Jim |title = ISWS is Pioneer in Tracking Tornadoes by Radar |publisher = Illinois State Water Survey |date = Apr 9, 2013 |url = http://www.isws.illinois.edu/hilites/press/130409radar.asp |accessdate = 2013-05-22 |archive-date = 2013-06-01 |archive-url = https://web.archive.org/web/20130601140628/http://www.isws.illinois.edu/hilites/press/130409radar.asp |url-status = dead }}</ref> ==References== {{reflist}} {{weather-stub}} [[Category:Weather]]