hail_thunderstorms-over-east-devon---29_30-october-2008---met-office.pdf
: The empirical relationship between radar reflectivity and rainfall rate is fixed whereas in reality this is highly dependent on precipitation type and is very different for rain and hail. Further information Grahame, N., Riddaway, B., Eadie, A., Hall, B. and McCallum, E., 2009: Exceptional hailstorm hits