Weather is an interesting thing.
It has the power to completely derail your vacation, but there are also those moments when you can help by stop and take in just how darn cool it is.
A roll cloud is a low, horizontal cloud formation that is created by cold fronts from sea winds in place of a thunderstorm. And while it's unlikely to delay any flights, but seeing one of these spin your way while speeding through the air at 40,000 feet could be a bit spooky.
Art consultant Amy King caught one of these spectacles on film from Chicago: