Lightning ect, in the Fl Keys while we were on the way out to fish on the reef. I think that there may be a waterspout involved with this event, but it was too dark and cloudy around the area to see it. Lightning was striking about every 5 sec in this spot, which is a pretty good indicator of tornado type activity.
You can see how the sky changed in this shot, about 1 minute later. Shooting details are the same in both, except focal length was 18mm in the first and 38 for this one.