Well I can tell you I was right around where this all happened. Back in I think the early 2000s there was a day somewhat like this. Not as bad, but the description was similar with the yellow sky and getting darker and darker. It never got pitch black. But it was pretty crazy. You could look right at the sun without a problem. It looked like a red ball. Some kids thought it was the moon. It turned out that there had been big forest fires up in Quebec and the wind turned during the night and blew this smoke down into NE. I can picture back in those days a big forest fire in some sparsely inhabited area and the wind did the same thing. Maybe some early editions of those mysterious fires that were supposed to be sweeping the midwest in the early 1800s?