Editing Wall cloud (section)

{{short description|Cloud formation occurring at the base of a thunderstorm}}
{{more citations needed|date=June 2014}}
{{Infobox Cloud
| name = Wall cloud (''Murus'')
| image location = Supercell thunderstorm over Needmore, Texas. May 4, 2019.jpg
| image name = A rain-free base with a wall cloud lowering in the foreground and precipitation in the background. Taken in [[Needmore, Bailey County, Texas|Needmore, Texas]].
| abbreviation = Cb mur.
| symbol = Clouds_CL_9.svg
| genus=Cumulonimbus (''heap, rain'')
| species= * Calvus
* Capillatus
| variety = None
| altitude_m = 500-16,000
| altitude_ft = 2,000-52,000
| level = low
| appearance = A dark cloud feature that protrudes from the base of a cumulonimbus more popularly known as a wall cloud.
| precipitation = Very common nearby, but not under : [[Rain]], [[Snow]], [[Snow pellets]] or [[Hail]], heavy at times
}}
A ''' wall cloud''' ('''murus'''<ref name=ICA2017>{{cite news|last1=Sutherland|first1=Scott|title=Cloud Atlas leaps into 21st century with 12 new cloud types|url=https://www.theweathernetwork.com/news/articles/cloud-atlas-leaps-into-21st-century-with-12-new-cloud-types/80685/|access-date=24 March 2017|work=The Weather Network|agency=Pelmorex Media|date=March 23, 2017}}</ref> or '''pedestal cloud''') is a large, localized, persistent, and often abrupt lowering of cloud that develops beneath the surrounding base of a [[cumulonimbus cloud]] and from which [[tornadoes]] sometimes form.<ref>{{cite web |url=http://www.geographic.org/climate/w.html |title=Definition of Wall Cloud |work=A Comprehensive Glossary of Weather |access-date=2013-01-21}}</ref> It is typically beneath the rain-free base (RFB)<ref>{{cite book |last = Branick |first = Mike L. |title = NOAA Technical Memorandum NWS SR-145: A Comprehensive Glossary of Weather Terms for Storm Spotters |publisher = National Weather Service |date = 1996 |url = http://www.srh.noaa.gov/oun/?n=spotterglossary3#Rain-Free%20Base |oclc = 39732655 }}</ref> portion of a [[thunderstorm]], and indicates the area of the strongest [[updraft]] within a storm. Rotating wall clouds are an indication of a [[mesocyclone]] in a thunderstorm; most strong tornadoes form from these. Many wall clouds do rotate; however, some do not.<ref>{{cite book |last=Branick |first=Mike L. |title=NOAA Technical Memorandum NWS SR-145: A Comprehensive Glossary of Weather Terms for Storm Spotters |publisher=National Weather Service |date=1996 |url=http://www.srh.noaa.gov/oun/?n=spotterglossary4#Wall%20Cloud |oclc=39732655 }}</ref><ref name="Training"/>