Thunderstorms clumping (IMAGE) University of New Mexico Caption An example of thunderstorms clumping together. Scientists are learning more about the interaction between thunderstorm clumping and water vapor. Credit Public Domain Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.