The polarization characteristics of electrically aligned ice particles in storm upper parts could be used to investigate electrification processes. As the in-cloud electric fields build up and intensify, ice particles tend toward near-vertical or vertical alignment, leading to the emergence of cross-polarization response. The depolarization (or cross-polarization) effects, which enhance before lightning discharges and diminish or dissipate within weakened electric fields due to lightning discharges, yield valuable insights into the microphysical and electrification processes in thunderstorm evolution. This paper reviews the progress in radar observations of the depolarization effects induced by electrically aligned ice particles, including findings from both dual-circular and dual-linear polarized weather radars. Additionally, recent observation results from an X-band dual-polarized multi-parameter phased array weather radar (MP-PAWR) are presented.