Object phasing in and out of view

We were walking on the beach and I was watching a massive developing thunderstorm out in the Ocean. I've seen shows where they speculate UFOs are frequently seen around huge thunderstorms, Volcano's, and natural disasters. So, I'm looking at the storm and something in the base of the storm phases in and out of view. I thought it could be an aircraft but pilots always avoid bad weather and fly around it. Pilots would especially avoid a giant thunderstorm if there were flying low only a couple of hundred feet above the water which it was. It phases in and out of view a couple of times not really moving. Planes have to move. I pulled out my camera and snapped a few pictures. I wished I had video the object but I didn't thick that fast. You have to zoom in to see it. So cool.