Cliff Mass is a meteorologist who specializes in weather prediction and modeling. A particular emphasis of his research has been the weather features of the western United States. The Seattle Times has called him the “closest thing to a celebrity scientist in Seattle,” and he is the author of The Weather of the Pacific Northwest—one of the best-selling books from the University of Washington Press. He also writes a popular blog about meteorological phenomena, among other weather-related musings, and he has a regular weather segment on one of the local NPR affiliates. Model simulations have been key tools for him and his group, which now runs the most extensive local high-resolution prediction system in the United States. He has received the Max Eaton Award from the American Meteorological Society, of which he is also a Fellow.