Définitions
1.NounLightning and/or thunder which the observer attributes to heat rather than a storm (e.g. because the storm/rain is too distant to be seen, or because there is no rain, as with dry lighting).
Visible lightning that occurs too far away for the resulting thunder to be audible by the observer.
Thunder that is heard without lightning being seen by the observer; heat thunder.
2.NounVisible lightning that occurs too far away for the resulting thunder to be audible by the observer.
3.NounThunder that is heard without lightning being seen by the observer; heat thunder.