Essentials of Meteorology: An Invitation to the Atmosphere,
9th Edition

Don Ahrens is Professor Emeritus at Modesto Junior College in Modesto, California. He has influenced countless professionals in the field of atmospheric science as well as hundreds of thousands of students who use his books to better understand weather and climate. In 2007, the National Weather Association awarded him a lifetime achievement award for these accomplishments. The bestselling author of two Cengage texts, Professor Ahrens received the Textbook and Academic Authors Association's McGuffey Longevity Award for the 9th Edition of his market-leading METEOROLOGY TODAY.

Robert Henson is a meteorologist and science writer at The Weather Company and a former science writer at the University Corporation for Atmospheric Research, the organization that manages the National Center for Atmospheric Research. An expert on tornadoes, thunderstorms and hurricanes, he also has analyzed how TV weathercasters cover major storms and report on climate change. Henson is the author of four books on meteorology, including THE THINKING PERSON'S GUIDE TO CLIMATE CHANGE (previously THE ROUGH GUIDE TO CLIMATE CHANGE), which was shortlisted for the UK Royal Society Prize for Science Books.