 that was seen over a large part of northeast North Dakota this morning and was not associated with severe weather. Some heavy downpours, yes, but no severe weather. Nevertheless, you look out your window and see that thing coming toward you. It is impressive, especially as you watch it, and it has a tendency to have that rolling function as it moves toward you. Roll clouds are not associated with tornadoes. They are associated usually with well-structured, dynamic rain complexes, usually of the convective variety, that is to say thunderstorms.