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A wall cloud (murus 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. It is typically beneath the rain-free base (RFB) 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.
https://en.wikipedia.org/wiki/Wall_cloud

de
Wallcloud
en
Wall cloud
fi
Seinäpilvi
fr
Mur de nuages
it
Nube a muro
lv
Sienas mākoņi
pl
Chmura stropowa


 

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