Dual-polarization observations of microbursts associated with intense convection: the 20 July storm during the MIST project

Abstract

In particular, multiparameter radar information is seen to have important implications for operational detection of this wind shear event. Noteworthy is the observation of a small shaft (<1km in horizontal dimensions) of near zero differential reflectivity (ZDR) surrounded by large positive ZDR values in the main precipitation core within a microburst-producing downdraft. This "ZDR-Hole' implies a strong localized downdraft composed of melting hail. -from Authors