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Hailstorm <br />Hailstorm: Description <br />According to the 2013 State of Texas Hazard Mitigation Plan Update, hail is defined <br />as a frozen precipitation in the form of small balls or lumps usually consisting of <br />concentric layers of clear ice and compact snow. <br />Hailstorm: Extent Scale <br />The magnitude of a hail event can be measured using the TORRO Hailstorm Intensity Scale and <br />corresponding diameter index in Tables 2.19 and 2.20. <br />Table 2.19, TORRO Hailstorm Intensity Scale <br />Risk Assessment <br />Intensity Typical Hail <br />Size CodeTypical Damage Impacts <br />CategoryDiameter (mm)* <br />H0Hard Hail5No damage <br />H1Potentially 5-15Slight general damage to plants, crops <br />Damaging <br />H2Significant10-20Significant damage to fruit, crops, vegetation <br />H3Severe20-30Severe damage to fruit and crops, damage to glass and <br />plastic structures, paint and wood scored <br />H4Severe25-40Widespread glass damage, vehicle bodywork damage <br />H5Destructive30-50Wholesale destruction of glass, damage to tiled roofs, <br />significant risk of injuries <br />H6Destructive40-60Bodywork of grounded aircraft dented, brick walls pitted <br />H7Destructive50-75Severe roof damage, risk of serious injuries <br />H8Destructive60-90(Severest recorded in the British Isles) Severe damage to <br />aircraft bodywork <br />H9Super Hail-75-100Extensive structural damage. Risk of severe or even fatal <br />stormsinjuries to persons caught in the open <br />H10Super Hail->100Extensive structural damage. Risk of severe or even fatal <br />stormsinjuries to persons caught in the open <br />(TORRO, 2017) <br />Maximum <br />Size CodeDescription <br />Diameter (mm) <br />05-9Pea <br />110-15Mothball <br />216-20Marble, grape <br />321-30Walnut <br />431-40Pigeon's egg > squash ball <br />541-50Golf ball > Pullet's egg <br />651-60Hen's egg <br />761-75Tennis ball > cricket ball <br />876-90Large orange > Soft ball <br />991-100Grapefruit <br />10>100Melon <br />Jurisdiction-specific data for location, previous occurrences, extent, probability, impact, and vulnerability <br />are found in jurisdiction annexes. <br />49 <br /> <br />