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Hail: Atmospheric precipitation occurring during warm seasons in the form of dense ice particles with diameters ranging from 5 mm to 15 cm, typically accompanying thunderstorms with heavy rain
Source: "SAFETY IN EMERGENCY SITUATIONS. NATURAL EMERGENCY SITUATIONS. TERMS AND DEFINITIONS. GOST 22.0.03-97/GOST R 22.0.03-95"
(approved by the Decree of the Russian State Standard dated May 25, 1995 No. 267)