<a href="https://en.wikipedia.org/wiki/Hook_echo" class="extiw" title="en:Hook echo">Hook echo</a> reflectivities on the Topeka <a href="https://en.wikipedia.org/wiki/National_Weather_Service" class="extiw" title="en:National Weather Service">US Weather Bureau</a> WSR-3 radar during the Meriden, Kansas, tornado in 1960.
National Weather Service, on the site of the Office in Detroit, MI
<a rel="nofollow" class="external free" href="https://www.weather.gov/images/dtx/events/1953%20Beecher/wsr3.jpg">https://www.weather.gov/images/dtx/events/1953%20Beecher/wsr3.jpg</a>