This is one of my two favorite photos from our 2004 excursion to the plains.  This was taken in southeastern Colorado.  I love the fact that the train and track bisects the photo, providing a dividing line between the storm and the grassy plain…and this photo has not been cropped.

This would be the other favorite from that trip.  This supercell was over western Kansas as we were looking east from Colorado.  We had to pull over and photograph the scene!