Editing Hook echo (section)

== Observational limitation ==

Hook echoes are not always obvious. Particularly in the [[Southern United States]], thunderstorms tend to take on a structure of more precipitation surrounding a mesocyclone, which leads to the high precipitation (HP) variation supercell that obscures the hook shape. HP supercells instead often have a high reflectivity pendant or front flank notch (FFN), appearing like a  "kidney bean" shape. Another limiting factor is radar resolution. Prior to 2008, NEXRAD had a range resolution of 1,000 meters, while the processes which lead to a hook echo happen on a smaller scale.<ref>{{cite web|title=NWS Louisville: Supercell Structure and Dynamics|url=http://www.crh.noaa.gov/lmk/soo/docu/supercell.php|access-date=1 June 2013}}</ref>