NY Times article
here.

“The way I felt when I first saw it was: Armageddon,” Jane Wiggins
said. Wiggins was a paralegal, working in downtown Cedar Rapids, Iowa, in June
2006, when she looked out her office window and saw an impenetrable shroud of
dark clouds looming over town. Everyone in the office stood up, Wiggins told me,
and some drifted to the window. The cloud was so enormous, so terrible and
strange, that it made the evening news. Wiggins, who had recently taken up
photography, took out her camera.

Thanks to Belinda.