Objects right before line of thunderstorms

I was driving my niece to cheer practice, I saw an object floating not moving in the sky pulsating like a welders arc you would see in a shop. So I'm sitting at the stop sign with my niece getting ready to head east debating if I should stare at it or keep driving. Along comes another object the same size and color darting out from the east. Both of these objects appeared right before a line of thunderstorms appeared and seemed to be pretty high up in the sky I would say 7,500 to 10,000 feet.