Outside Cookstown during a thrilling storm chase on July 25th 2013. Suddenly my mobile rang, I stopped and answered, it was Paul, we exchanged brief intense comments on the storm them decided we should meet, Paul was much further S and on his way N and would be near my location soon, we decided to meet at an obvious location, I recalled passing a couple of parked trucks along the main road so we decided to meet there. Min's later I was parked at the road beside the trucks waiting on Paul to arrive. The shelf cloud was a mean sight over the main road with good structure while thunder continued to rumble and lightning whipped several i-c and more deadly c-g bolts from the core, I got out for a few shots to get up close and personal with the storm, it was a lot closer than it seems in this ultra wide angle capture. I could see a marked green colour within the precip and even within the shelf cloud, green is rare in this country and is more typical of severe thunderstorms in the US, however green wasn't all that was happening, I also could see very striking rotation to the centre of the storm behind the shelf where those dark scud clouds were operating. I mean this was rotating full tilt, it was very easy to see with great consistent turning motion, this rotation and the structure reminded me of videos I had watched of a HP supercell, read the report for more information. * All images are available for sale in the form of photo prints, canvas or digital files for licensing, if you are interested in a purchase simply drop me an email.