Yesterday's weather was strange. We'd have thunderstorms one minute and the next it would be bright and sunny. Not typical weather for the month of November, at least not in PA.
Look at how forboding the sky looks here.
If you turned the other direction, this was the view that you saw. Mind you, about 3 minutes later, the sky opened up and your visiblity wasn't more than 2 inches in front of your nose.