I was sitting on the south end of the st pete/clearwater airport between 12:00 and 12:30 pm. i don't remember exactly what day or month but it was hot out. there was a puffy cloud that was kind vertical in shape. out of this cloud i saw a silver/glowing object pop out horizontally and then go back inside the cloud, or what looked like going inside the cloud. it would pop in and out of the cloud, back and forth and when it popped out, it was a little higher than before. i looked away and back serval times to make sure i was seeing this. i got out of my truck and took my sun glasses off and it was still there popping in and out of the cloud. i couldn't believe it. it was so real. i made a sketch from a pic i took at the exact place i was sitting. i know i was at an airport, but planes cannot move like what i saw. i ate lunch there a lot as i watched planes land a takeoff so i know what a plane in the air looks like.