Hail using rockets and artillery shells. Hail suppression programs have been undertaken by 15 countries between 1965 and 2005. Hail Hail is a form of solid precipitation. It is distinct from ice pellets (American English "sleet"), though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailstone. Ice pellets fall generally in cold weather while hail growth is greatly inhibited during cold surface temperatures. Unlike other forms of water ice such as graupel, which is made of rime, and ice pellets, which are smaller and translucent, hailstones usually measure between
David Sleet David Sleet David A. Sleet is an American scientist recognized for championing the application of behavioral science to unintentional injury prevention and helping to establish injury prevention as a global public health concern. He has published hundreds of articles and book chapters and was co-editor of the Handbook of Injury and Violence Prevention.; Injury and Violence Prevention: Behavioral Science Theories; Derryberry’s Educating for Health; and the international prize-winning World Report on Road Traffic Injury Prevention. In 2016, Dr. Sleet retired from the Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia where he served as the Associate Director for