Kelvin-Helmholtz waves observed by a polarimetric prototype of the WSR-88D radar

Two observations of Kelvin-Helmholtz (KH) waves made by the dual-polarization KOUN radar and the operational KTLX radar in Oklahoma are studied and presented in this paper. Both events occurred in precipitation and the radar bright band was embedded within the wind shear layer. The wave-like features are clearly displayed in the dual-polarimetric moments of the KOUN radar. The wavelengths and amplitudes of these waves are estimated. Wave breaking is also clearly observed. The Richardson numbers of ambient atmosphere are calculated based on the rawinsonde observations near the radar. Then the observations are compared with linear stability analysis.