Abstract
Severe hailfall occurred in Gunma and Saitama prefectures on June 2, 2022. The relationship
between the hailfall characteristics and damages was investigated using information from local
governments, news reports, interviews with schools, and weather reports from citizens. The
hailfall area was approximately 70 km long and 17 km wide. Hailstone size ranged from smaller
than 1 cm to larger than 5 cm in maximum diameter. This hailfall caused extensive damage to
people (95 persons), residential and non-residential buildings (approximately 2,325 cases),
agriculture (at least 3.39 billion yen), and vehicles. Human casualties occurred in areas with
hailstones larger than 5 cm. Residential and non-residential damages occurred in areas with
hailstones larger than 3 cm. On the other hand, agricultural damage was reported in areas with
hailstones smaller than 3 cm. Car body dents were observed in areas with hailstones larger than
1 cm of hail.
