Last night I had an opportunity to observe distant lightning. It was partly cloudy here and very hazy, with the brighter stars visible. There were two areas of thunderstorms "nearby" One cluster to the south about 35 miles away; it must have been a doozy because for an hour or so there were flashes lighting my sky several times a second. I think I could here the thunder as a continuous low rumble, but it was hard to tell since it's Katydid season here in NJ and they can be deafening (though I love the background when watching meteors. Makes my observation tapes very interesting). Sound travel time for these storms was about 3 minutes, and with the continuous lightning it was a continuous sound.<br />The other cluster was about 50 miles to the north, with much less frequent lightning; several per minute. Interestingly, this thunder I could hear better, maybe due to a temperature inversion, as distinct soft rumbles. Sound travel time about 4 1/2 minutes.<br />We received no rain or visible lightning strokes here.<br />So, the flashes that lit up the whole sky on a hazy night can be observed at least 50 miles away. I am sure that with tall thundrheads the flashes can light up the sky beyond where the sound can be heard, probably several hundred miles away. Currently under investigation <img src="/images/icons/smile.gif" /><br />Thanks for bringing up this subject, I have always been planning to see how far away thunderstorms can be observed this way, and you have inspired me, Pioneer0333!<br />I will report on further observations as the distance is extended. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>