The sky suddenly turn into dark with the wind come too faster and the cloud was highly like as gray cabbage. and then the air feel so stuffy. it usually called thunder cloud (comulunimbus). On rain season right now. Thunder could be happened cause transfering negative electron into positive electron. Any science thinks that it’s the one factor of thunder. so thunder was appear cause
transfering negative electron into positive electron in the sky with large capacity. There are any step when thunder appear. At the first is compressing electricity on the sky. And mayority it will be above over there is cloud negative and in the step one of behind is positive cloud. After that cloud will be combine and thunder appear.
Thunder appear between :
Cloud with cloud
On its cloud
Cloud into the air
Cloud into soil (earth)
The voltage of thunder minimum nearby1.000.000 per meter. So be careful if you don’t want hit by thunder.