How fast is the wind blowing? How much moisture is in the air? Meteorologists measure weather conditions to help answer these and other questions. Learn about the tools and systems they use. Find out how these measurements help people plan their days and prepare for any weather.

Nancy Dickmann has written more than 150 non-fiction books for children, specializing in science and history. Before becoming an author, she worked for many years as an editor and publisher of children’s books.