lightning causes thunder. lightning happens instantaneously, but thunder (at a distance) sounds like it’s coming, then it claps, then fades away. this don’t make no damn sense given that light and sound move at fixed rates.
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Fork lightning often happens in a single strike, but the rolling thunder is usually sheet lighting, which is a lot of smaller discharges within a cloud or between nearby clouds… You can have rolling thunder from fork lightning, when there are multiple discharges, but it’s usually chains of sheet lightning
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