Looking Down the Line

Shelf Cloud Blow Through Cedar FAlls, Iowa, Photo by Craig Johnson, Copyright 2019

Shelf clouds are among the most impressive on the planet. This one looked worse than it was. Forming on the boundary between warm moist air ahead of a thunderstorms and cooler air rushing out of the advancing storm, shelf clouds look scary! This one passed harmlessly overhead. Scroll down for more images of this and other shelf clouds.