A storm feat

[Metalballrun]

How powerful would be a worldwide storm?

To give details to this novel I read:

• It should've lasted around 5 minutes maximum.
• It reduced Bronze Age civilizations 11 thousand years ago back to the Stone Age. History then went as we know it minus this event.

 

[AceOfSpaces3709]

According to this page the energy required to create a planetary storm varies from as small as 4.09 Zettajoules (978 Giatons of TNT/Large Island level+) to as large as 48.2 Zettajoules (11.5 Teratons of TNT/Country level) though it all depends on the height and thickness of the clouds

 

[TheGreatJedi13]

depends on the storm and how it was done
there is one calc that can reach up to a continent level using the condensation method
so yeah it varies and context is needed on how strong the storm is since a method to calc them is either condensation method or cape method