Hailstorms 2 : Shower-like precipitation in the form of irregular pellets, or balls of ice more than five millimeters in diameter, falling from a cumulonimbus cloud.
New York City Government, New York City Natural Hazard Mitigation Plan, Appendix B: Glossary, New York, USA 2009. http://www.nyc.gov/html/oem/downloads/pdf/hazard_m itigation/appendix_b_glossary.pdf, (ND/ Gen - Amer) {894}