Thunderhead Explosion

It's time for my weekly thunderhead cloud photo :) I really hadn't intended to do this, but just about dusk, I started to see the lightning in the thunderheads clouds. I have never been able to photograph lightning, so this was the next best thing for me. Hopefully in time I'll learn a bit about how to photograph these things, but for now, I'll try and catch the thunderheads when they go by.....

BTW, no rain or thunder.. just clouds & flashes of lightning...