Mesometeorology was defined by Ligda in 1951 to include phe nomena which are too large to be observed by in situ sensors at a single station but too small to be defined adequately by conven tional station networks. The scientific, economic, and social im portance of weather events on the scales of 10-1000 km is not a new discovery, but only recently have the weather services, research laboratories, and academic scientists of the world begun to concen trate attention on these phenomena. An Advanced Study Institute was organized by the present editors to provide a focus and forum for review and...