There were some very active thunder storms here recently. They started during the night over in Fife so I popped down to the beach for a look. Unfortunately they were a bit too distant to catch any lightning on the camera despite taking about 40 long exposures.
In this image, most of the structure in the central cloud is visible due to various lightning flashes over the course of about a minute or so.
Tags: Sony A6000 Sigma 17-70mm Thunder Storms Distant Clouds Fife