Charles, I can answer your question pretty quickly. It is really just a matter of how sound travels and how light travels. You can see lightening and hear no thunder because, in general, thunder only travels 10 to 20 miles. Lightening, on the other hand, can be seen from outerspace! So if you have an unobstructed view, you could expect to see lighting from hundreds of miles away. As for hearing thunder but seeing no lightening, it is again the way the two travel. You could easily hear the thunder caused by a cloud to cloud strike of lightening that is completely obscured from the ground because of heavy cloud cover. One thing is sure: thunder and lightening go hand in hand. Just because you see only the one, doesn't mean the other one wasn't there. df drchb777@aol.com wrote: >charles browning of calif. usa asks: > > >Your answer on thunder/lightning was >excellent; well done. But could you >please tell us why sometimes you hear >thunder and see no lightning, and see >lightning but hear no thunder? Help! >Thx. >