A long, tubular cloud that appears to roll about a horizontal axis. Often forms along the leading edge of a storm front or gust front. Indicates a change in wind direction and can precede severe ...

tornadoes frequently form in marginal environments where it seems like one or more ‘ingredients’ to storm formation is missing or lacking,” he said. Then, the bottom of the clouds darken and ...

MOLINE, Ill. — Storm clouds come in many shapes and sizes, but what about their colors? What can that tell us about a particular storm? That's a question John from Milan, Illinois, submitted ...

However, you can observe several atmospheric clues to identify whether a storm is intensifying or causing severe weather. Shelf clouds, also known as arcus clouds, are ominous, low-hanging clouds ...