Spherical-shaped UFO spotted in Tampa

On December 18, 2015, a person was driving on Sunset Skyway Bridge (located in Tampa, Florida). He was looking at the ocean when he has noticed, in the sky, a white and bright spherical-shaped UFO. What is it?

Witness statement:

I was in Tampa Florida heading towards Anna Meria island from the Skywaybrige I decided to take some pictures for our memory back/Facebook. And when I looked their it was just hovering over the water that's when I noticed it and took pictures of it, amazing sight it was like standstill like it was just handing in the sky with no strings it was perfectly circle nice and metallic steal look to it. I have seen these orbs/lights before I'm no stranger to them. When I noticed the orb I was so excited felt like I had a connection I felt so good inside love peace shocked. The feelings I had were just one of a kind. I lost sight of the object when my girl kepted driving.