We're going backwards here, having discussed thunder first, then its cause, lightning 2nd. However, they are both ultra impressive atmospheric phenomena.
Lightning will be our next topic.
https://www.nssl.noaa.gov/education/svrwx101/lightning/
Charge distribution in storm clouds [+]
A conceptual model shows the electrical charge distribution inside deep convection (thunderstorms), developed by NSSL and university scientists. In the main updraft (in and above the red arrow), there are four main charge regions. In the convective region but outside the outdraft (in and above the blue arrow), there are more than four charge regions.https://www.youtube.com/watch?v=ViZNgU-Yt-Y
https://www.youtube.com/watch?v=yc2-363MIQs&vl=en
https://www.youtube.com/watch?v=c-DOYY-2PJY
https://www.youtube.com/watch?v=W-w0nluaJmM
https://www.youtube.com/watch?v=wd100P1kOo8