Thunder was the name for sound generated by the occurrence of lightning.
According to Professor Robert Crater, the sound of a herd of buffalo running was akin to that of thunder. (TOS: "The Man Trap")
In 2370, Kira Nerys and Vedek Bareil Antos heard what seemed to be thunder while walking through Bareil's monastery. As it was a sunny day and therefore there should not have been any thunder, Bareil questioned how what they were hearing was possible. Kira recognized the sound as that of weapons being fired. (DS9: "The Circle")