Thunder
From Memory Alpha, the free Star Trek reference
Thunder is the name for sound generated by the occurence of lightning.
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 when there should not be thunder, Bareil questioned how what they were hearing was possible. Kira recognized the sound as that of weapons being fired. (DS9: "The Circle")
