Here's how much electricity was measured in one thundercloud - The

Muons helped measure the potential difference of a thundercloud at 1300000000 volts, by Yury Erofeev

Atmosphere, Free Full-Text

Atmospheric electricity - Wikipedia

Lightning Strikes Twice, and Scientists Still Don't Know What's Going On, by Robert Roy Britt

Rays From Exploding Stars May Help Measure Strength of Thunderstorms - The New York Times

Solved A thundercloud has the charge distribution

Solved Problem 24.58 The charge center of a thundercloud

Gamma-ray phenomena linked to lightning strikes, by Robert Lea, Predict

High-Speed Camera Captures Amazing Downward And Upward Lightning

Climate Change May Spark More Lightning Strikes, Igniting Wildfires

Lightning - One of Nature's Most Striking Phenomena